diff --git a/README.md b/README.md
index e5896e9..8f0995f 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ or choose x64 platform when running on a Windows Desktop PC with the HoloLens 2
 
 The [openxr_preview](https://github.com/microsoft/OpenXR-MixedReality/tree/main/openxr_preview) folder contains a set of [preview header files](https://github.com/microsoft/OpenXR-MixedReality/tree/main/openxr_preview/include/openxr) containing the following OpenXR extensions that are only available [in preview runtime](http://aka.ms/openxr-preview).
 
-1. [XR_MSFT_spatial_anchor_export_preview](https://microsoft.github.io/OpenXR-MixedReality/openxr_preview/specs/openxr.html#XR_MSFT_SPATIAL_ANCHOR_EXPORT_PREVIEW)
+1. There's no additional preview extensions in latest preview runtime.
 
 Please send feedback on preview extensions and samples at [GitHub issues](https://github.com/microsoft/OpenXR-MixedReality/issues).
 We are planning to incorporate your feedback and finalize these extensions as vendor extensions (MSFT) or cross-vendor extensions (EXT)
diff --git a/openxr_preview/include/openxr/openxr.h b/openxr_preview/include/openxr/openxr.h
index fb1c4a0..2428d0d 100644
--- a/openxr_preview/include/openxr/openxr.h
+++ b/openxr_preview/include/openxr/openxr.h
@@ -25,7 +25,7 @@ extern "C" {
     ((((major) & 0xffffULL) << 48) | (((minor) & 0xffffULL) << 32) | ((patch) & 0xffffffffULL))
 
 // OpenXR current version number.
-#define XR_CURRENT_API_VERSION XR_MAKE_VERSION(1, 0, 18)
+#define XR_CURRENT_API_VERSION XR_MAKE_VERSION(1, 0, 19)
 
 #define XR_VERSION_MAJOR(version) (uint16_t)(((uint64_t)(version) >> 48)& 0xffffULL)
 #define XR_VERSION_MINOR(version) (uint16_t)(((uint64_t)(version) >> 32) & 0xffffULL)
@@ -198,9 +198,6 @@ typedef enum XrResult {
     XR_ERROR_COLOR_SPACE_UNSUPPORTED_FB = -1000108000,
     XR_ERROR_SPATIAL_ANCHOR_NAME_NOT_FOUND_MSFT = -1000142001,
     XR_ERROR_SPATIAL_ANCHOR_NAME_INVALID_MSFT = -1000142002,
-    XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT = 1000062000,
-    XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT = -1000062000,
-    XR_ERROR_SPATIAL_ANCHOR_SUFFICIENCY_QUERY_FAILED_MSFT = -1000062001,
     XR_RESULT_MAX_ENUM = 0x7FFFFFFF
 } XrResult;
 
@@ -297,7 +294,6 @@ typedef enum XrStructureType {
     XR_TYPE_COMPOSITION_LAYER_ALPHA_BLEND_FB = 1000041001,
     XR_TYPE_VIEW_CONFIGURATION_DEPTH_RANGE_EXT = 1000046000,
     XR_TYPE_GRAPHICS_BINDING_EGL_MNDX = 1000048004,
-    XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT = 1000049000,
     XR_TYPE_SYSTEM_HAND_TRACKING_PROPERTIES_EXT = 1000051000,
     XR_TYPE_HAND_TRACKER_CREATE_INFO_EXT = 1000051001,
     XR_TYPE_HAND_JOINTS_LOCATE_INFO_EXT = 1000051002,
@@ -355,6 +351,10 @@ typedef enum XrStructureType {
     XR_TYPE_SCENE_DESERIALIZE_INFO_MSFT = 1000098001,
     XR_TYPE_EVENT_DATA_DISPLAY_REFRESH_RATE_CHANGED_FB = 1000101000,
     XR_TYPE_SYSTEM_COLOR_SPACE_PROPERTIES_FB = 1000108000,
+    XR_TYPE_HAND_TRACKING_MESH_FB = 1000110001,
+    XR_TYPE_HAND_TRACKING_SCALE_FB = 1000110003,
+    XR_TYPE_HAND_TRACKING_AIM_STATE_FB = 1000111001,
+    XR_TYPE_HAND_TRACKING_CAPSULES_STATE_FB = 1000112000,
     XR_TYPE_FOVEATION_PROFILE_CREATE_INFO_FB = 1000114000,
     XR_TYPE_SWAPCHAIN_CREATE_INFO_FOVEATION_FB = 1000114001,
     XR_TYPE_SWAPCHAIN_STATE_FOVEATION_FB = 1000114002,
@@ -370,8 +370,12 @@ typedef enum XrStructureType {
     XR_TYPE_SWAPCHAIN_STATE_ANDROID_SURFACE_DIMENSIONS_FB = 1000161000,
     XR_TYPE_SWAPCHAIN_STATE_SAMPLER_OPENGL_ES_FB = 1000162000,
     XR_TYPE_SWAPCHAIN_STATE_SAMPLER_VULKAN_FB = 1000163000,
-    XR_TYPE_SPATIAL_ANCHOR_EXPORT_PURPOSE_INFO_MSFT = 1000062000,
-    XR_TYPE_SPATIAL_ANCHOR_EXPORT_SUFFICIENCY_MSFT = 1000062001,
+    XR_TYPE_COMPOSITION_LAYER_SPACE_WARP_INFO_FB = 1000171000,
+    XR_TYPE_SYSTEM_SPACE_WARP_PROPERTIES_FB = 1000171001,
+    XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT = 1000049000,
+    XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_CREATE_INFO_MSFT = 1000049001,
+    XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_GET_INFO_MSFT = 1000049002,
+    XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_MSFT = 1000049003,
     XR_TYPE_GRAPHICS_BINDING_VULKAN2_KHR = XR_TYPE_GRAPHICS_BINDING_VULKAN_KHR,
     XR_TYPE_SWAPCHAIN_IMAGE_VULKAN2_KHR = XR_TYPE_SWAPCHAIN_IMAGE_VULKAN_KHR,
     XR_TYPE_GRAPHICS_REQUIREMENTS_VULKAN2_KHR = XR_TYPE_GRAPHICS_REQUIREMENTS_VULKAN_KHR,
@@ -452,7 +456,7 @@ typedef enum XrObjectType {
     XR_OBJECT_TYPE_SCENE_MSFT = 1000097001,
     XR_OBJECT_TYPE_FOVEATION_PROFILE_FB = 1000114000,
     XR_OBJECT_TYPE_SPATIAL_ANCHOR_STORE_CONNECTION_MSFT = 1000142000,
-    XR_OBJECT_TYPE_SPATIAL_ANCHOR_NEIGHBORHOOD_DATA_STREAM_MSFT = 1000062000,
+    XR_OBJECT_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_MSFT = 1000049000,
     XR_OBJECT_TYPE_MAX_ENUM = 0x7FFFFFFF
 } XrObjectType;
 typedef XrFlags64 XrInstanceCreateFlags;
@@ -1527,7 +1531,7 @@ typedef struct XrCompositionLayerEquirect2KHR {
 #define XR_KHR_binding_modification 1
 #define XR_KHR_binding_modification_SPEC_VERSION 1
 #define XR_KHR_BINDING_MODIFICATION_EXTENSION_NAME "XR_KHR_binding_modification"
-typedef struct XrBindingModificationBaseHeaderKHR {
+typedef struct XR_MAY_ALIAS XrBindingModificationBaseHeaderKHR {
     XrStructureType             type;
     const void* XR_MAY_ALIAS    next;
 } XrBindingModificationBaseHeaderKHR;
@@ -1933,8 +1937,12 @@ XRAPI_ATTR XrResult XRAPI_CALL xrSetInputDeviceLocationEXT(
 
 
 #define XR_MSFT_spatial_graph_bridge 1
+
+            XR_DEFINE_HANDLE(XrSpatialGraphStaticNodeBindingMSFT)
+
 #define XR_MSFT_spatial_graph_bridge_SPEC_VERSION 1
 #define XR_MSFT_SPATIAL_GRAPH_BRIDGE_EXTENSION_NAME "XR_MSFT_spatial_graph_bridge"
+#define XR_GUID_SIZE_MSFT                 16
 
 typedef enum XrSpatialGraphNodeTypeMSFT {
     XR_SPATIAL_GRAPH_NODE_TYPE_STATIC_MSFT = 1,
@@ -1949,7 +1957,30 @@ typedef struct XrSpatialGraphNodeSpaceCreateInfoMSFT {
     XrPosef                       pose;
 } XrSpatialGraphNodeSpaceCreateInfoMSFT;
 
+typedef struct XrSpatialGraphStaticNodeBindingCreateInfoMSFT {
+    XrStructureType             type;
+    const void* XR_MAY_ALIAS    next;
+    XrSpace                     space;
+    XrPosef                     poseInSpace;
+    XrTime                      time;
+} XrSpatialGraphStaticNodeBindingCreateInfoMSFT;
+
+typedef struct XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT {
+    XrStructureType             type;
+    const void* XR_MAY_ALIAS    next;
+} XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT;
+
+typedef struct XrSpatialGraphStaticNodeBindingPropertiesMSFT {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    uint8_t               nodeId[XR_GUID_SIZE_MSFT];
+    XrPosef               poseInNodeSpace;
+} XrSpatialGraphStaticNodeBindingPropertiesMSFT;
+
 typedef XrResult (XRAPI_PTR *PFN_xrCreateSpatialGraphNodeSpaceMSFT)(XrSession session, const XrSpatialGraphNodeSpaceCreateInfoMSFT* createInfo, XrSpace* space);
+typedef XrResult (XRAPI_PTR *PFN_xrTryCreateSpatialGraphStaticNodeBindingMSFT)(XrSession session, const XrSpatialGraphStaticNodeBindingCreateInfoMSFT* createInfo, XrSpatialGraphStaticNodeBindingMSFT* nodeBinding);
+typedef XrResult (XRAPI_PTR *PFN_xrDestroySpatialGraphStaticNodeBindingMSFT)(XrSpatialGraphStaticNodeBindingMSFT nodeBinding);
+typedef XrResult (XRAPI_PTR *PFN_xrGetSpatialGraphStaticNodeBindingPropertiesMSFT)(XrSpatialGraphStaticNodeBindingMSFT nodeBinding, const XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT* getInfo, XrSpatialGraphStaticNodeBindingPropertiesMSFT* properties);
 
 #ifndef XR_NO_PROTOTYPES
 #ifdef XR_EXTENSION_PROTOTYPES
@@ -1957,6 +1988,19 @@ XRAPI_ATTR XrResult XRAPI_CALL xrCreateSpatialGraphNodeSpaceMSFT(
     XrSession                                   session,
     const XrSpatialGraphNodeSpaceCreateInfoMSFT* createInfo,
     XrSpace*                                    space);
+
+XRAPI_ATTR XrResult XRAPI_CALL xrTryCreateSpatialGraphStaticNodeBindingMSFT(
+    XrSession                                   session,
+    const XrSpatialGraphStaticNodeBindingCreateInfoMSFT* createInfo,
+    XrSpatialGraphStaticNodeBindingMSFT*        nodeBinding);
+
+XRAPI_ATTR XrResult XRAPI_CALL xrDestroySpatialGraphStaticNodeBindingMSFT(
+    XrSpatialGraphStaticNodeBindingMSFT         nodeBinding);
+
+XRAPI_ATTR XrResult XRAPI_CALL xrGetSpatialGraphStaticNodeBindingPropertiesMSFT(
+    XrSpatialGraphStaticNodeBindingMSFT         nodeBinding,
+    const XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT* getInfo,
+    XrSpatialGraphStaticNodeBindingPropertiesMSFT* properties);
 #endif /* XR_EXTENSION_PROTOTYPES */
 #endif /* !XR_NO_PROTOTYPES */
 
@@ -2321,61 +2365,6 @@ typedef struct XrViewConfigurationViewFovEPIC {
 
 
 
-#define XR_MSFT_spatial_anchor_export_preview 1
-
-            XR_DEFINE_HANDLE(XrSpatialAnchorNeighborhoodDataStreamMSFT)
-
-#define XR_MSFT_spatial_anchor_export_preview_SPEC_VERSION 1
-#define XR_MSFT_SPATIAL_ANCHOR_EXPORT_PREVIEW_EXTENSION_NAME "XR_MSFT_spatial_anchor_export_preview"
-
-typedef enum XrSpatialAnchorExportPurposeMSFT {
-    XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_RELOCALIZATION_MSFT = 0,
-    XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_SHARING_MSFT = 1,
-    XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_MAX_ENUM_MSFT = 0x7FFFFFFF
-} XrSpatialAnchorExportPurposeMSFT;
-typedef struct XrSpatialAnchorExportPurposeInfoMSFT {
-    XrStructureType                     type;
-    const void* XR_MAY_ALIAS            next;
-    XrSpatialAnchorExportPurposeMSFT    exportPurpose;
-} XrSpatialAnchorExportPurposeInfoMSFT;
-
-typedef struct XrSpatialAnchorExportSufficiencyMSFT {
-    XrStructureType             type;
-    const void* XR_MAY_ALIAS    next;
-    XrBool32                    isMinimallySufficient;
-    float                       recommendedSufficiencyLevel;
-    float                       sufficiencyLevel;
-} XrSpatialAnchorExportSufficiencyMSFT;
-
-typedef XrResult (XRAPI_PTR *PFN_xrCreateSpatialAnchorNeighborhoodDataStreamMSFT)(XrSpatialAnchorMSFT spatialAnchor, const XrSpatialAnchorExportPurposeInfoMSFT* exportPurposeInfo, XrSpatialAnchorNeighborhoodDataStreamMSFT* neighborhoodDataStream);
-typedef XrResult (XRAPI_PTR *PFN_xrDestroySpatialAnchorNeighborhoodDataStreamMSFT)(XrSpatialAnchorNeighborhoodDataStreamMSFT neighborhoodDataStream);
-typedef XrResult (XRAPI_PTR *PFN_xrReadSpatialAnchorNeighborhoodDataMSFT)(XrSpatialAnchorNeighborhoodDataStreamMSFT neighborhoodDataStream, uint32_t bytesToRead, uint32_t* bytesRead, void* buffer);
-typedef XrResult (XRAPI_PTR *PFN_xrGetSpatialAnchorExportSufficiencyMSFT)(XrSpatialAnchorMSFT spatialAnchor, const XrSpatialAnchorExportPurposeInfoMSFT* exportPurposeInfo, XrSpatialAnchorExportSufficiencyMSFT* exportSufficiency);
-
-#ifndef XR_NO_PROTOTYPES
-#ifdef XR_EXTENSION_PROTOTYPES
-XRAPI_ATTR XrResult XRAPI_CALL xrCreateSpatialAnchorNeighborhoodDataStreamMSFT(
-    XrSpatialAnchorMSFT                         spatialAnchor,
-    const XrSpatialAnchorExportPurposeInfoMSFT* exportPurposeInfo,
-    XrSpatialAnchorNeighborhoodDataStreamMSFT*  neighborhoodDataStream);
-
-XRAPI_ATTR XrResult XRAPI_CALL xrDestroySpatialAnchorNeighborhoodDataStreamMSFT(
-    XrSpatialAnchorNeighborhoodDataStreamMSFT   neighborhoodDataStream);
-
-XRAPI_ATTR XrResult XRAPI_CALL xrReadSpatialAnchorNeighborhoodDataMSFT(
-    XrSpatialAnchorNeighborhoodDataStreamMSFT   neighborhoodDataStream,
-    uint32_t                                    bytesToRead,
-    uint32_t*                                   bytesRead,
-    void* XR_MAY_ALIAS                          buffer);
-
-XRAPI_ATTR XrResult XRAPI_CALL xrGetSpatialAnchorExportSufficiencyMSFT(
-    XrSpatialAnchorMSFT                         spatialAnchor,
-    const XrSpatialAnchorExportPurposeInfoMSFT* exportPurposeInfo,
-    XrSpatialAnchorExportSufficiencyMSFT*       exportSufficiency);
-#endif /* XR_EXTENSION_PROTOTYPES */
-#endif /* !XR_NO_PROTOTYPES */
-
-
 #define XR_MSFT_composition_layer_reprojection 1
 #define XR_MSFT_composition_layer_reprojection_SPEC_VERSION 1
 #define XR_MSFT_COMPOSITION_LAYER_REPROJECTION_EXTENSION_NAME "XR_MSFT_composition_layer_reprojection"
@@ -2466,9 +2455,8 @@ typedef struct XrCompositionLayerSecureContentFB {
 
 
 #define XR_VALVE_analog_threshold 1
-#define XR_VALVE_analog_threshold_SPEC_VERSION 1
+#define XR_VALVE_analog_threshold_SPEC_VERSION 2
 #define XR_VALVE_ANALOG_THRESHOLD_EXTENSION_NAME "XR_VALVE_analog_threshold"
-// XrInteractionProfileAnalogThresholdVALVE extends XrInteractionProfileSuggestedBinding
 typedef struct XrInteractionProfileAnalogThresholdVALVE {
     XrStructureType              type;
     const void* XR_MAY_ALIAS     next;
@@ -2960,6 +2948,107 @@ XRAPI_ATTR XrResult XRAPI_CALL xrSetColorSpaceFB(
 #endif /* !XR_NO_PROTOTYPES */
 
 
+#define XR_FB_hand_tracking_mesh 1
+#define XR_FB_hand_tracking_mesh_SPEC_VERSION 1
+#define XR_FB_HAND_TRACKING_MESH_EXTENSION_NAME "XR_FB_hand_tracking_mesh"
+typedef struct XrVector4sFB {
+    int16_t    x;
+    int16_t    y;
+    int16_t    z;
+    int16_t    w;
+} XrVector4sFB;
+
+typedef struct XrHandTrackingMeshFB {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    uint32_t              jointCapacityInput;
+    uint32_t              jointCountOutput;
+    XrPosef*              jointBindPoses;
+    float*                jointRadii;
+    XrHandJointEXT*       jointParents;
+    uint32_t              vertexCapacityInput;
+    uint32_t              vertexCountOutput;
+    XrVector3f*           vertexPositions;
+    XrVector3f*           vertexNormals;
+    XrVector2f*           vertexUVs;
+    XrVector4sFB*         vertexBlendIndices;
+    XrVector4f*           vertexBlendWeights;
+    uint32_t              indexCapacityInput;
+    uint32_t              indexCountOutput;
+    int16_t*              indices;
+} XrHandTrackingMeshFB;
+
+// XrHandTrackingScaleFB extends XrHandJointsLocateInfoEXT
+typedef struct XrHandTrackingScaleFB {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    float                 sensorOutput;
+    float                 currentOutput;
+    XrBool32              overrideHandScale;
+    float                 overrideValueInput;
+} XrHandTrackingScaleFB;
+
+typedef XrResult (XRAPI_PTR *PFN_xrGetHandMeshFB)(XrHandTrackerEXT handTracker, XrHandTrackingMeshFB* mesh);
+
+#ifndef XR_NO_PROTOTYPES
+#ifdef XR_EXTENSION_PROTOTYPES
+XRAPI_ATTR XrResult XRAPI_CALL xrGetHandMeshFB(
+    XrHandTrackerEXT                            handTracker,
+    XrHandTrackingMeshFB*                       mesh);
+#endif /* XR_EXTENSION_PROTOTYPES */
+#endif /* !XR_NO_PROTOTYPES */
+
+
+#define XR_FB_hand_tracking_aim 1
+#define XR_FB_hand_tracking_aim_SPEC_VERSION 1
+#define XR_FB_HAND_TRACKING_AIM_EXTENSION_NAME "XR_FB_hand_tracking_aim"
+typedef XrFlags64 XrHandTrackingAimFlagsFB;
+
+// Flag bits for XrHandTrackingAimFlagsFB
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_COMPUTED_BIT_FB = 0x00000001;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_VALID_BIT_FB = 0x00000002;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_INDEX_PINCHING_BIT_FB = 0x00000004;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_MIDDLE_PINCHING_BIT_FB = 0x00000008;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_RING_PINCHING_BIT_FB = 0x00000010;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_LITTLE_PINCHING_BIT_FB = 0x00000020;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_SYSTEM_GESTURE_BIT_FB = 0x00000040;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_DOMINANT_HAND_BIT_FB = 0x00000080;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_MENU_PRESSED_BIT_FB = 0x00000100;
+
+// XrHandTrackingAimStateFB extends XrHandJointsLocateInfoEXT
+typedef struct XrHandTrackingAimStateFB {
+    XrStructureType             type;
+    void* XR_MAY_ALIAS          next;
+    XrHandTrackingAimFlagsFB    status;
+    XrPosef                     aimPose;
+    float                       pinchStrengthIndex;
+    float                       pinchStrengthMiddle;
+    float                       pinchStrengthRing;
+    float                       pinchStrengthLittle;
+} XrHandTrackingAimStateFB;
+
+
+
+#define XR_FB_hand_tracking_capsules 1
+#define XR_FB_HAND_TRACKING_CAPSULE_POINT_COUNT 2
+#define XR_FB_HAND_TRACKING_CAPSULE_COUNT 19
+#define XR_FB_hand_tracking_capsules_SPEC_VERSION 1
+#define XR_FB_HAND_TRACKING_CAPSULES_EXTENSION_NAME "XR_FB_hand_tracking_capsules"
+typedef struct XrHandCapsuleFB {
+    XrVector3f        points[XR_FB_HAND_TRACKING_CAPSULE_POINT_COUNT];
+    float             radius;
+    XrHandJointEXT    joint;
+} XrHandCapsuleFB;
+
+// XrHandTrackingCapsulesStateFB extends XrHandJointsLocateInfoEXT
+typedef struct XrHandTrackingCapsulesStateFB {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    XrHandCapsuleFB       capsules[XR_FB_HAND_TRACKING_CAPSULE_COUNT];
+} XrHandTrackingCapsulesStateFB;
+
+
+
 #define XR_FB_foveation 1
 XR_DEFINE_HANDLE(XrFoveationProfileFB)
 #define XR_FB_foveation_SPEC_VERSION      1
@@ -3154,6 +3243,37 @@ XRAPI_ATTR XrResult XRAPI_CALL xrClearSpatialAnchorStoreMSFT(
 #endif /* XR_EXTENSION_PROTOTYPES */
 #endif /* !XR_NO_PROTOTYPES */
 
+
+#define XR_FB_space_warp 1
+#define XR_FB_space_warp_SPEC_VERSION     1
+#define XR_FB_SPACE_WARP_EXTENSION_NAME   "XR_FB_space_warp"
+typedef XrFlags64 XrCompositionLayerSpaceWarpInfoFlagsFB;
+
+// Flag bits for XrCompositionLayerSpaceWarpInfoFlagsFB
+
+// XrCompositionLayerSpaceWarpInfoFB extends XrCompositionLayerProjectionView
+typedef struct XrCompositionLayerSpaceWarpInfoFB {
+    XrStructureType                           type;
+    const void* XR_MAY_ALIAS                  next;
+    XrCompositionLayerSpaceWarpInfoFlagsFB    layerFlags;
+    XrSwapchainSubImage                       motionVectorSubImage;
+    XrPosef                                   appSpaceDeltaPose;
+    XrSwapchainSubImage                       depthSubImage;
+    float                                     minDepth;
+    float                                     maxDepth;
+    float                                     nearZ;
+    float                                     farZ;
+} XrCompositionLayerSpaceWarpInfoFB;
+
+// XrSystemSpaceWarpPropertiesFB extends XrSystemProperties
+typedef struct XrSystemSpaceWarpPropertiesFB {
+    XrStructureType       type;
+    void* XR_MAY_ALIAS    next;
+    uint32_t              recommendedMotionVectorImageRectWidth;
+    uint32_t              recommendedMotionVectorImageRectHeight;
+} XrSystemSpaceWarpPropertiesFB;
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/openxr_preview/include/openxr/openxr_reflection.h b/openxr_preview/include/openxr/openxr_reflection.h
index 06bcd4b..3e5d0b4 100644
--- a/openxr_preview/include/openxr/openxr_reflection.h
+++ b/openxr_preview/include/openxr/openxr_reflection.h
@@ -102,9 +102,6 @@ XR_ENUM_STR(XrResult);
     _(XR_ERROR_COLOR_SPACE_UNSUPPORTED_FB, -1000108000) \
     _(XR_ERROR_SPATIAL_ANCHOR_NAME_NOT_FOUND_MSFT, -1000142001) \
     _(XR_ERROR_SPATIAL_ANCHOR_NAME_INVALID_MSFT, -1000142002) \
-    _(XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT, 1000062000) \
-    _(XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT, -1000062000) \
-    _(XR_ERROR_SPATIAL_ANCHOR_SUFFICIENCY_QUERY_FAILED_MSFT, -1000062001) \
     _(XR_RESULT_MAX_ENUM, 0x7FFFFFFF)
 
 #define XR_LIST_ENUM_XrStructureType(_) \
@@ -200,7 +197,6 @@ XR_ENUM_STR(XrResult);
     _(XR_TYPE_COMPOSITION_LAYER_ALPHA_BLEND_FB, 1000041001) \
     _(XR_TYPE_VIEW_CONFIGURATION_DEPTH_RANGE_EXT, 1000046000) \
     _(XR_TYPE_GRAPHICS_BINDING_EGL_MNDX, 1000048004) \
-    _(XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT, 1000049000) \
     _(XR_TYPE_SYSTEM_HAND_TRACKING_PROPERTIES_EXT, 1000051000) \
     _(XR_TYPE_HAND_TRACKER_CREATE_INFO_EXT, 1000051001) \
     _(XR_TYPE_HAND_JOINTS_LOCATE_INFO_EXT, 1000051002) \
@@ -258,6 +254,10 @@ XR_ENUM_STR(XrResult);
     _(XR_TYPE_SCENE_DESERIALIZE_INFO_MSFT, 1000098001) \
     _(XR_TYPE_EVENT_DATA_DISPLAY_REFRESH_RATE_CHANGED_FB, 1000101000) \
     _(XR_TYPE_SYSTEM_COLOR_SPACE_PROPERTIES_FB, 1000108000) \
+    _(XR_TYPE_HAND_TRACKING_MESH_FB, 1000110001) \
+    _(XR_TYPE_HAND_TRACKING_SCALE_FB, 1000110003) \
+    _(XR_TYPE_HAND_TRACKING_AIM_STATE_FB, 1000111001) \
+    _(XR_TYPE_HAND_TRACKING_CAPSULES_STATE_FB, 1000112000) \
     _(XR_TYPE_FOVEATION_PROFILE_CREATE_INFO_FB, 1000114000) \
     _(XR_TYPE_SWAPCHAIN_CREATE_INFO_FOVEATION_FB, 1000114001) \
     _(XR_TYPE_SWAPCHAIN_STATE_FOVEATION_FB, 1000114002) \
@@ -273,8 +273,12 @@ XR_ENUM_STR(XrResult);
     _(XR_TYPE_SWAPCHAIN_STATE_ANDROID_SURFACE_DIMENSIONS_FB, 1000161000) \
     _(XR_TYPE_SWAPCHAIN_STATE_SAMPLER_OPENGL_ES_FB, 1000162000) \
     _(XR_TYPE_SWAPCHAIN_STATE_SAMPLER_VULKAN_FB, 1000163000) \
-    _(XR_TYPE_SPATIAL_ANCHOR_EXPORT_PURPOSE_INFO_MSFT, 1000062000) \
-    _(XR_TYPE_SPATIAL_ANCHOR_EXPORT_SUFFICIENCY_MSFT, 1000062001) \
+    _(XR_TYPE_COMPOSITION_LAYER_SPACE_WARP_INFO_FB, 1000171000) \
+    _(XR_TYPE_SYSTEM_SPACE_WARP_PROPERTIES_FB, 1000171001) \
+    _(XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT, 1000049000) \
+    _(XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_CREATE_INFO_MSFT, 1000049001) \
+    _(XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_GET_INFO_MSFT, 1000049002) \
+    _(XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_MSFT, 1000049003) \
     _(XR_STRUCTURE_TYPE_MAX_ENUM, 0x7FFFFFFF)
 
 #define XR_LIST_ENUM_XrFormFactor(_) \
@@ -344,7 +348,7 @@ XR_ENUM_STR(XrResult);
     _(XR_OBJECT_TYPE_SCENE_MSFT, 1000097001) \
     _(XR_OBJECT_TYPE_FOVEATION_PROFILE_FB, 1000114000) \
     _(XR_OBJECT_TYPE_SPATIAL_ANCHOR_STORE_CONNECTION_MSFT, 1000142000) \
-    _(XR_OBJECT_TYPE_SPATIAL_ANCHOR_NEIGHBORHOOD_DATA_STREAM_MSFT, 1000062000) \
+    _(XR_OBJECT_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_MSFT, 1000049000) \
     _(XR_OBJECT_TYPE_MAX_ENUM, 0x7FFFFFFF)
 
 #define XR_LIST_ENUM_XrAndroidThreadTypeKHR(_) \
@@ -441,11 +445,6 @@ XR_ENUM_STR(XrResult);
     _(XR_HAND_POSE_TYPE_REFERENCE_OPEN_PALM_MSFT, 1) \
     _(XR_HAND_POSE_TYPE_MAX_ENUM_MSFT, 0x7FFFFFFF)
 
-#define XR_LIST_ENUM_XrSpatialAnchorExportPurposeMSFT(_) \
-    _(XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_RELOCALIZATION_MSFT, 0) \
-    _(XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_SHARING_MSFT, 1) \
-    _(XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_MAX_ENUM_MSFT, 0x7FFFFFFF)
-
 #define XR_LIST_ENUM_XrReprojectionModeMSFT(_) \
     _(XR_REPROJECTION_MODE_DEPTH_MSFT, 1) \
     _(XR_REPROJECTION_MODE_PLANAR_FROM_DEPTH_MSFT, 2) \
@@ -611,12 +610,25 @@ XR_ENUM_STR(XrResult);
     _(XR_COMPOSITION_LAYER_SECURE_CONTENT_EXCLUDE_LAYER_BIT_FB, 0x00000001) \
     _(XR_COMPOSITION_LAYER_SECURE_CONTENT_REPLACE_LAYER_BIT_FB, 0x00000002) \
 
+#define XR_LIST_BITS_XrHandTrackingAimFlagsFB(_) \
+    _(XR_HAND_TRACKING_AIM_COMPUTED_BIT_FB, 0x00000001) \
+    _(XR_HAND_TRACKING_AIM_VALID_BIT_FB, 0x00000002) \
+    _(XR_HAND_TRACKING_AIM_INDEX_PINCHING_BIT_FB, 0x00000004) \
+    _(XR_HAND_TRACKING_AIM_MIDDLE_PINCHING_BIT_FB, 0x00000008) \
+    _(XR_HAND_TRACKING_AIM_RING_PINCHING_BIT_FB, 0x00000010) \
+    _(XR_HAND_TRACKING_AIM_LITTLE_PINCHING_BIT_FB, 0x00000020) \
+    _(XR_HAND_TRACKING_AIM_SYSTEM_GESTURE_BIT_FB, 0x00000040) \
+    _(XR_HAND_TRACKING_AIM_DOMINANT_HAND_BIT_FB, 0x00000080) \
+    _(XR_HAND_TRACKING_AIM_MENU_PRESSED_BIT_FB, 0x00000100) \
+
 #define XR_LIST_BITS_XrSwapchainCreateFoveationFlagsFB(_) \
     _(XR_SWAPCHAIN_CREATE_FOVEATION_SCALED_BIN_BIT_FB, 0x00000001) \
     _(XR_SWAPCHAIN_CREATE_FOVEATION_FRAGMENT_DENSITY_MAP_BIT_FB, 0x00000002) \
 
 #define XR_LIST_BITS_XrSwapchainStateFoveationFlagsFB(_)
 
+#define XR_LIST_BITS_XrCompositionLayerSpaceWarpInfoFlagsFB(_)
+
 #define XR_LIST_STRUCT_XrApiLayerProperties(_) \
     _(type) \
     _(next) \
@@ -1415,6 +1427,23 @@ XR_ENUM_STR(XrResult);
     _(nodeId) \
     _(pose) \
 
+#define XR_LIST_STRUCT_XrSpatialGraphStaticNodeBindingCreateInfoMSFT(_) \
+    _(type) \
+    _(next) \
+    _(space) \
+    _(poseInSpace) \
+    _(time) \
+
+#define XR_LIST_STRUCT_XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT(_) \
+    _(type) \
+    _(next) \
+
+#define XR_LIST_STRUCT_XrSpatialGraphStaticNodeBindingPropertiesMSFT(_) \
+    _(type) \
+    _(next) \
+    _(nodeId) \
+    _(poseInNodeSpace) \
+
 #define XR_LIST_STRUCT_XrSystemHandTrackingPropertiesEXT(_) \
     _(type) \
     _(next) \
@@ -1577,18 +1606,6 @@ XR_ENUM_STR(XrResult);
     _(recommendedFov) \
     _(maxMutableFov) \
 
-#define XR_LIST_STRUCT_XrSpatialAnchorExportPurposeInfoMSFT(_) \
-    _(type) \
-    _(next) \
-    _(exportPurpose) \
-
-#define XR_LIST_STRUCT_XrSpatialAnchorExportSufficiencyMSFT(_) \
-    _(type) \
-    _(next) \
-    _(isMinimallySufficient) \
-    _(recommendedSufficiencyLevel) \
-    _(sufficiencyLevel) \
-
 #define XR_LIST_STRUCT_XrHolographicWindowAttachmentMSFT(_) \
     _(type) \
     _(next) \
@@ -1823,6 +1840,59 @@ XR_ENUM_STR(XrResult);
     _(next) \
     _(colorSpace) \
 
+#define XR_LIST_STRUCT_XrVector4sFB(_) \
+    _(x) \
+    _(y) \
+    _(z) \
+    _(w) \
+
+#define XR_LIST_STRUCT_XrHandTrackingMeshFB(_) \
+    _(type) \
+    _(next) \
+    _(jointCapacityInput) \
+    _(jointCountOutput) \
+    _(jointBindPoses) \
+    _(jointRadii) \
+    _(jointParents) \
+    _(vertexCapacityInput) \
+    _(vertexCountOutput) \
+    _(vertexPositions) \
+    _(vertexNormals) \
+    _(vertexUVs) \
+    _(vertexBlendIndices) \
+    _(vertexBlendWeights) \
+    _(indexCapacityInput) \
+    _(indexCountOutput) \
+    _(indices) \
+
+#define XR_LIST_STRUCT_XrHandTrackingScaleFB(_) \
+    _(type) \
+    _(next) \
+    _(sensorOutput) \
+    _(currentOutput) \
+    _(overrideHandScale) \
+    _(overrideValueInput) \
+
+#define XR_LIST_STRUCT_XrHandTrackingAimStateFB(_) \
+    _(type) \
+    _(next) \
+    _(status) \
+    _(aimPose) \
+    _(pinchStrengthIndex) \
+    _(pinchStrengthMiddle) \
+    _(pinchStrengthRing) \
+    _(pinchStrengthLittle) \
+
+#define XR_LIST_STRUCT_XrHandCapsuleFB(_) \
+    _(points) \
+    _(radius) \
+    _(joint) \
+
+#define XR_LIST_STRUCT_XrHandTrackingCapsulesStateFB(_) \
+    _(type) \
+    _(next) \
+    _(capsules) \
+
 #define XR_LIST_STRUCT_XrFoveationProfileCreateInfoFB(_) \
     _(type) \
     _(next) \
@@ -1923,6 +1993,24 @@ XR_ENUM_STR(XrResult);
     _(maxAnisotropy) \
     _(borderColor) \
 
+#define XR_LIST_STRUCT_XrCompositionLayerSpaceWarpInfoFB(_) \
+    _(type) \
+    _(next) \
+    _(layerFlags) \
+    _(motionVectorSubImage) \
+    _(appSpaceDeltaPose) \
+    _(depthSubImage) \
+    _(minDepth) \
+    _(maxDepth) \
+    _(nearZ) \
+    _(farZ) \
+
+#define XR_LIST_STRUCT_XrSystemSpaceWarpPropertiesFB(_) \
+    _(type) \
+    _(next) \
+    _(recommendedMotionVectorImageRectWidth) \
+    _(recommendedMotionVectorImageRectHeight) \
+
 
 
 #define XR_LIST_STRUCTURE_TYPES_CORE(_) \
@@ -1999,6 +2087,9 @@ XR_ENUM_STR(XrResult);
     _(XrCompositionLayerAlphaBlendFB, XR_TYPE_COMPOSITION_LAYER_ALPHA_BLEND_FB) \
     _(XrViewConfigurationDepthRangeEXT, XR_TYPE_VIEW_CONFIGURATION_DEPTH_RANGE_EXT) \
     _(XrSpatialGraphNodeSpaceCreateInfoMSFT, XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT) \
+    _(XrSpatialGraphStaticNodeBindingCreateInfoMSFT, XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_CREATE_INFO_MSFT) \
+    _(XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT, XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_GET_INFO_MSFT) \
+    _(XrSpatialGraphStaticNodeBindingPropertiesMSFT, XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_MSFT) \
     _(XrSystemHandTrackingPropertiesEXT, XR_TYPE_SYSTEM_HAND_TRACKING_PROPERTIES_EXT) \
     _(XrHandTrackerCreateInfoEXT, XR_TYPE_HAND_TRACKER_CREATE_INFO_EXT) \
     _(XrHandJointsLocateInfoEXT, XR_TYPE_HAND_JOINTS_LOCATE_INFO_EXT) \
@@ -2021,8 +2112,6 @@ XR_ENUM_STR(XrResult);
     _(XrControllerModelNodeStateMSFT, XR_TYPE_CONTROLLER_MODEL_NODE_STATE_MSFT) \
     _(XrControllerModelStateMSFT, XR_TYPE_CONTROLLER_MODEL_STATE_MSFT) \
     _(XrViewConfigurationViewFovEPIC, XR_TYPE_VIEW_CONFIGURATION_VIEW_FOV_EPIC) \
-    _(XrSpatialAnchorExportPurposeInfoMSFT, XR_TYPE_SPATIAL_ANCHOR_EXPORT_PURPOSE_INFO_MSFT) \
-    _(XrSpatialAnchorExportSufficiencyMSFT, XR_TYPE_SPATIAL_ANCHOR_EXPORT_SUFFICIENCY_MSFT) \
     _(XrCompositionLayerReprojectionInfoMSFT, XR_TYPE_COMPOSITION_LAYER_REPROJECTION_INFO_MSFT) \
     _(XrCompositionLayerReprojectionPlaneOverrideMSFT, XR_TYPE_COMPOSITION_LAYER_REPROJECTION_PLANE_OVERRIDE_MSFT) \
     _(XrCompositionLayerSecureContentFB, XR_TYPE_COMPOSITION_LAYER_SECURE_CONTENT_FB) \
@@ -2051,6 +2140,10 @@ XR_ENUM_STR(XrResult);
     _(XrSceneDeserializeInfoMSFT, XR_TYPE_SCENE_DESERIALIZE_INFO_MSFT) \
     _(XrEventDataDisplayRefreshRateChangedFB, XR_TYPE_EVENT_DATA_DISPLAY_REFRESH_RATE_CHANGED_FB) \
     _(XrSystemColorSpacePropertiesFB, XR_TYPE_SYSTEM_COLOR_SPACE_PROPERTIES_FB) \
+    _(XrHandTrackingMeshFB, XR_TYPE_HAND_TRACKING_MESH_FB) \
+    _(XrHandTrackingScaleFB, XR_TYPE_HAND_TRACKING_SCALE_FB) \
+    _(XrHandTrackingAimStateFB, XR_TYPE_HAND_TRACKING_AIM_STATE_FB) \
+    _(XrHandTrackingCapsulesStateFB, XR_TYPE_HAND_TRACKING_CAPSULES_STATE_FB) \
     _(XrFoveationProfileCreateInfoFB, XR_TYPE_FOVEATION_PROFILE_CREATE_INFO_FB) \
     _(XrSwapchainCreateInfoFoveationFB, XR_TYPE_SWAPCHAIN_CREATE_INFO_FOVEATION_FB) \
     _(XrSwapchainStateFoveationFB, XR_TYPE_SWAPCHAIN_STATE_FOVEATION_FB) \
@@ -2061,6 +2154,8 @@ XR_ENUM_STR(XrResult);
     _(XrCompositionLayerDepthTestVARJO, XR_TYPE_COMPOSITION_LAYER_DEPTH_TEST_VARJO) \
     _(XrSpatialAnchorPersistenceInfoMSFT, XR_TYPE_SPATIAL_ANCHOR_PERSISTENCE_INFO_MSFT) \
     _(XrSpatialAnchorFromPersistedAnchorCreateInfoMSFT, XR_TYPE_SPATIAL_ANCHOR_FROM_PERSISTED_ANCHOR_CREATE_INFO_MSFT) \
+    _(XrCompositionLayerSpaceWarpInfoFB, XR_TYPE_COMPOSITION_LAYER_SPACE_WARP_INFO_FB) \
+    _(XrSystemSpaceWarpPropertiesFB, XR_TYPE_SYSTEM_SPACE_WARP_PROPERTIES_FB) \
 
 
 
@@ -2260,7 +2355,6 @@ XR_ENUM_STR(XrResult);
     _(XR_MSFT_perception_anchor_interop, 57) \
     _(XR_EXT_win32_appcontainer_compatible, 58) \
     _(XR_EPIC_view_configuration_fov, 60) \
-    _(XR_MSFT_spatial_anchor_export_preview, 63) \
     _(XR_MSFT_holographic_window_attachment, 64) \
     _(XR_MSFT_composition_layer_reprojection, 67) \
     _(XR_HUAWEI_controller_interaction, 70) \
@@ -2281,6 +2375,9 @@ XR_ENUM_STR(XrResult);
     _(XR_FB_display_refresh_rate, 102) \
     _(XR_HTC_vive_cosmos_controller_interaction, 103) \
     _(XR_FB_color_space, 109) \
+    _(XR_FB_hand_tracking_mesh, 111) \
+    _(XR_FB_hand_tracking_aim, 112) \
+    _(XR_FB_hand_tracking_capsules, 113) \
     _(XR_FB_foveation, 115) \
     _(XR_FB_foveation_configuration, 116) \
     _(XR_KHR_binding_modification, 121) \
@@ -2294,6 +2391,7 @@ XR_ENUM_STR(XrResult);
     _(XR_FB_swapchain_update_state_opengl_es, 163) \
     _(XR_FB_swapchain_update_state_vulkan, 164) \
     _(XR_KHR_swapchain_usage_input_attachment_bit, 166) \
+    _(XR_FB_space_warp, 172) \
 
 
 #endif
diff --git a/openxr_preview/specs/openxr.html b/openxr_preview/specs/openxr.html
index cdaaa46..9a9912e 100644
--- a/openxr_preview/specs/openxr.html
+++ b/openxr_preview/specs/openxr.html
@@ -4,26 +4,24 @@
 <meta charset="UTF-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.12">
+<meta name="generator" content="Asciidoctor 2.0.16">
 <meta name="author" content="Copyright (c) 2017-2021, The Khronos Group Inc.">
 <title>The OpenXR Specification</title>
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
 <style>
-/* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
-/* Uncomment @import statement to use as custom stylesheet */
-/*@import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700";*/
-article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}
-audio,video{display:inline-block}
-audio:not([controls]){display:none;height:0}
-html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}
+/*! Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
+/* Uncomment the following line when using as a custom stylesheet */
+/* @import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700"; */
+html{font-family:sans-serif;-webkit-text-size-adjust:100%}
 a{background:none}
 a:focus{outline:thin dotted}
 a:active,a:hover{outline:0}
 h1{font-size:2em;margin:.67em 0}
-abbr[title]{border-bottom:1px dotted}
 b,strong{font-weight:bold}
+abbr{font-size:.9em}
+abbr[title]{cursor:help;border-bottom:1px dotted #dddddf;text-decoration:none}
 dfn{font-style:italic}
-hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0}
+hr{height:0}
 mark{background:#ff0;color:#000}
 code,kbd,pre,samp{font-family:monospace;font-size:1em}
 pre{white-space:pre-wrap}
@@ -35,20 +33,22 @@ sub{bottom:-.25em}
 img{border:0}
 svg:not(:root){overflow:hidden}
 figure{margin:0}
+audio,video{display:inline-block}
+audio:not([controls]){display:none;height:0}
 fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}
 legend{border:0;padding:0}
 button,input,select,textarea{font-family:inherit;font-size:100%;margin:0}
 button,input{line-height:normal}
 button,select{text-transform:none}
-button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}
+button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}
 button[disabled],html input[disabled]{cursor:default}
-input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0}
+input[type=checkbox],input[type=radio]{padding:0}
 button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}
 textarea{overflow:auto;vertical-align:top}
 table{border-collapse:collapse;border-spacing:0}
-*,*::before,*::after{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}
+*,::before,::after{box-sizing:border-box}
 html,body{font-size:100%}
-body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;font-weight:400;font-style:normal;line-height:1;position:relative;cursor:auto;tab-size:4;word-wrap:anywhere;-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased}
+body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;line-height:1;position:relative;cursor:auto;-moz-tab-size:4;-o-tab-size:4;tab-size:4;word-wrap:anywhere;-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased}
 a:hover{cursor:pointer}
 img,object,embed{max-width:100%;height:auto}
 object,embed{height:100%}
@@ -68,7 +68,7 @@ div,dl,dt,dd,ul,ol,li,h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6,
 a{color:#2156a5;text-decoration:underline;line-height:inherit}
 a:hover,a:focus{color:#1d4b8f}
 a img{border:0}
-p{font-family:inherit;font-weight:400;font-size:1em;line-height:1.6;margin-bottom:1.25em;text-rendering:optimizeLegibility}
+p{line-height:1.6;margin-bottom:1.25em;text-rendering:optimizeLegibility}
 p aside{font-size:.875em;line-height:1.35;font-style:italic}
 h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{font-family:"Open Sans","DejaVu Sans",sans-serif;font-weight:300;font-style:normal;color:#ba3925;text-rendering:optimizeLegibility;margin-top:1em;margin-bottom:.5em;line-height:1.0125em}
 h1 small,h2 small,h3 small,#toctitle small,.sidebarblock>.content>.title small,h4 small,h5 small,h6 small{font-size:60%;color:#e99b8f;line-height:0}
@@ -77,14 +77,14 @@ h2{font-size:1.6875em}
 h3,#toctitle,.sidebarblock>.content>.title{font-size:1.375em}
 h4,h5{font-size:1.125em}
 h6{font-size:1em}
-hr{border:solid #dddddf;border-width:1px 0 0;clear:both;margin:1.25em 0 1.1875em;height:0}
+hr{border:solid #dddddf;border-width:1px 0 0;clear:both;margin:1.25em 0 1.1875em}
 em,i{font-style:italic;line-height:inherit}
 strong,b{font-weight:bold;line-height:inherit}
 small{font-size:60%;line-height:inherit}
 code{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;font-weight:400;color:rgba(0,0,0,.9)}
-ul,ol,dl{font-size:1em;line-height:1.6;margin-bottom:1.25em;list-style-position:outside;font-family:inherit}
+ul,ol,dl{line-height:1.6;margin-bottom:1.25em;list-style-position:outside;font-family:inherit}
 ul,ol{margin-left:1.5em}
-ul li ul,ul li ol{margin-left:1.25em;margin-bottom:0;font-size:1em}
+ul li ul,ul li ol{margin-left:1.25em;margin-bottom:0}
 ul.square li ul,ul.circle li ul,ul.disc li ul{list-style:inherit}
 ul.square{list-style-type:square}
 ul.circle{list-style-type:circle}
@@ -92,19 +92,14 @@ ul.disc{list-style-type:disc}
 ol li ul,ol li ol{margin-left:1.25em;margin-bottom:0}
 dl dt{margin-bottom:.3125em;font-weight:bold}
 dl dd{margin-bottom:1.25em}
-abbr,acronym{text-transform:uppercase;font-size:90%;color:rgba(0,0,0,.8);border-bottom:1px dotted #ddd;cursor:help}
-abbr{text-transform:none}
 blockquote{margin:0 0 1.25em;padding:.5625em 1.25em 0 1.1875em;border-left:1px solid #ddd}
-blockquote cite{display:block;font-size:.9375em;color:rgba(0,0,0,.6)}
-blockquote cite::before{content:"\2014 \0020"}
-blockquote cite a,blockquote cite a:visited{color:rgba(0,0,0,.6)}
 blockquote,blockquote p{line-height:1.6;color:rgba(0,0,0,.85)}
 @media screen and (min-width:768px){h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{line-height:1.2}
 h1{font-size:2.75em}
 h2{font-size:2.3125em}
 h3,#toctitle,.sidebarblock>.content>.title{font-size:1.6875em}
 h4{font-size:1.4375em}}
-table{background:#fff;margin-bottom:1.25em;border:solid 1px #dedede;word-wrap:normal}
+table{background:#fff;margin-bottom:1.25em;border:1px solid #dedede;word-wrap:normal}
 table thead,table tfoot{background:#f7f8f7}
 table thead tr th,table thead tr td,table tfoot tr th,table tfoot tr td{padding:.5em .625em .625em;font-size:inherit;color:rgba(0,0,0,.8);text-align:left}
 table tr th,table tr td{padding:.5625em .625em;font-size:inherit;color:rgba(0,0,0,.8)}
@@ -119,7 +114,7 @@ h1 strong,h2 strong,h3 strong,#toctitle strong,.sidebarblock>.content>.title str
 :not(pre).nobreak{word-wrap:normal}
 :not(pre).nowrap{white-space:nowrap}
 :not(pre).pre-wrap{white-space:pre-wrap}
-:not(pre):not([class^=L])>code{font-size:.9375em;font-style:normal!important;letter-spacing:0;padding:.1em .5ex;word-spacing:-.15em;background:#f7f7f8;-webkit-border-radius:4px;border-radius:4px;line-height:1.45;text-rendering:optimizeSpeed}
+:not(pre):not([class^=L])>code{font-size:.9375em;font-style:normal!important;letter-spacing:0;padding:.1em .5ex;word-spacing:-.15em;background:#f7f7f8;border-radius:4px;line-height:1.45;text-rendering:optimizeSpeed}
 pre{color:rgba(0,0,0,.9);font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;line-height:1.45;text-rendering:optimizeSpeed}
 pre code,pre pre{color:inherit;font-size:inherit;line-height:inherit}
 pre>code{display:block}
@@ -127,7 +122,7 @@ pre.nowrap,pre.nowrap pre{white-space:pre;word-wrap:normal}
 em em{font-style:normal}
 strong strong{font-weight:400}
 .keyseq{color:rgba(51,51,51,.8)}
-kbd{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;display:inline-block;color:rgba(0,0,0,.8);font-size:.65em;line-height:1.45;background:#f7f7f7;border:1px solid #ccc;-webkit-border-radius:3px;border-radius:3px;-webkit-box-shadow:0 1px 0 rgba(0,0,0,.2),0 0 0 .1em white inset;box-shadow:0 1px 0 rgba(0,0,0,.2),0 0 0 .1em #fff inset;margin:0 .15em;padding:.2em .5em;vertical-align:middle;position:relative;top:-.1em;white-space:nowrap}
+kbd{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;display:inline-block;color:rgba(0,0,0,.8);font-size:.65em;line-height:1.45;background:#f7f7f7;border:1px solid #ccc;border-radius:3px;box-shadow:0 1px 0 rgba(0,0,0,.2),inset 0 0 0 .1em #fff;margin:0 .15em;padding:.2em .5em;vertical-align:middle;position:relative;top:-.1em;white-space:nowrap}
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 .keyseq kbd:last-child{margin-right:0}
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@@ -139,7 +134,7 @@ b.button::before,b.button::after{position:relative;top:-1px;font-weight:400}
 b.button::before{content:"[";padding:0 3px 0 2px}
 b.button::after{content:"]";padding:0 2px 0 3px}
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+#header,#content,#footnotes,#footer{width:100%;margin:0 auto;max-width:62.5em;*zoom:1;position:relative;padding-left:.9375em;padding-right:.9375em}
 #header::before,#header::after,#content::before,#content::after,#footnotes::before,#footnotes::after,#footer::before,#footer::after{content:" ";display:table}
 #header::after,#content::after,#footnotes::after,#footer::after{clear:both}
 #content{margin-top:1.25em}
@@ -147,7 +142,7 @@ p a>code:hover{color:rgba(0,0,0,.9)}
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+#header .details{border-bottom:1px solid #dddddf;line-height:1.45;padding-top:.25em;padding-bottom:.25em;padding-left:.25em;color:rgba(0,0,0,.6);display:flex;flex-flow:row wrap}
 #header .details span:first-child{margin-left:-.125em}
 #header .details span.email a{color:rgba(0,0,0,.85)}
 #header .details br{display:none}
@@ -181,11 +176,11 @@ body.toc2.toc-right #toc.toc2{border-right-width:0;border-left:1px solid #e7e7e9
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 #toc.toc2 ul ul{padding-left:1.25em}
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+#content #toc{border:1px solid #e0e0dc;margin-bottom:1.25em;padding:1.25em;background:#f8f8f7;border-radius:4px}
 #content #toc>:first-child{margin-top:0}
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 #footer{max-width:none;background:rgba(0,0,0,.8);padding:1.25em}
-#footer-text{color:rgba(255,255,255,.8);line-height:1.44}
+#footer-text{color:hsla(0,0%,100%,.8);line-height:1.44}
 #content{margin-bottom:.625em}
 .sect1{padding-bottom:.625em}
 @media screen and (min-width:768px){#content{margin-bottom:1.25em}
@@ -198,29 +193,32 @@ body.toc2.toc-right{padding-left:0;padding-right:20em}}
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-details>summary:first-of-type{cursor:pointer;display:list-item;outline:none;margin-bottom:.75em}
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@@ -228,7 +226,7 @@ table.tableblock #preamble>.sectionbody>[class="paragraph"]:first-of-type p{font
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-.listingblock pre.highlightjs>code{padding:1em;-webkit-border-radius:4px;border-radius:4px}
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 .prettyprint{background:#f7f7f8}
 pre.prettyprint .linenums{line-height:1.45;margin-left:2em}
@@ -238,8 +236,8 @@ pre.prettyprint li:not(:first-child) code[data-lang]::before{display:none}
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-pre.pygments .lineno{border-right:1px solid currentColor;opacity:.35;display:inline-block;margin-right:.75em}
+table.linenotable td.linenos{border-right:1px solid;opacity:.35;padding-right:.5em}
+pre.pygments .lineno{border-right:1px solid;opacity:.35;display:inline-block;margin-right:.75em}
 pre.pygments .lineno::before{content:"";margin-right:-.125em}
 .quoteblock{margin:0 1em 1.25em 1.5em;display:table}
 .quoteblock:not(.excerpt)>.title{margin-left:-1.5em;margin-bottom:.75em}
@@ -249,7 +247,7 @@ pre.pygments .lineno::before{content:"";margin-right:-.125em}
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-.verseblock pre{font-family:"Open Sans","DejaVu Sans",sans;font-size:1.15rem;color:rgba(0,0,0,.85);font-weight:300;text-rendering:optimizeLegibility}
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 .quoteblock .attribution,.verseblock .attribution{font-size:.9375em;line-height:1.45;font-style:italic}
@@ -262,7 +260,7 @@ pre.pygments .lineno::before{content:"";margin-right:-.125em}
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-.quoteblock.excerpt .attribution,.quoteblock .quoteblock .attribution{color:inherit;text-align:left;margin-right:0}
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 p.tableblock:last-child{margin-bottom:0}
 td.tableblock>.content{margin-bottom:1.25em;word-wrap:anywhere}
 td.tableblock>.content>:last-child{margin-bottom:-1.25em}
@@ -297,10 +295,10 @@ ol>li p,ul>li p,ul dd,ol dd,.olist .olist,.ulist .ulist,.ulist .olist,.olist .ul
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+ul.checklist>li>p:first-child{margin-left:-1em}
+ul.checklist>li>p:first-child>.fa-square-o:first-child,ul.checklist>li>p:first-child>.fa-check-square-o:first-child{width:1.25em;font-size:.8em;position:relative;bottom:.125em}
+ul.checklist>li>p:first-child>input[type=checkbox]:first-child{margin-right:.25em}
+ul.inline{display:flex;flex-flow:row wrap;list-style:none;margin:0 0 .625em -1.25em}
 ul.inline>li{margin-left:1.25em}
 .unstyled dl dt{font-weight:400;font-style:normal}
 ol.arabic{list-style-type:decimal}
@@ -319,7 +317,7 @@ td.hdlist2{word-wrap:anywhere}
 .colist td:not([class]):first-child{padding:.4em .75em 0;line-height:1;vertical-align:top}
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-.thumb,.th{line-height:0;display:inline-block;border:solid 4px #fff;-webkit-box-shadow:0 0 0 1px #ddd;box-shadow:0 0 0 1px #ddd}
+.thumb,.th{line-height:0;display:inline-block;border:4px solid #fff;box-shadow:0 0 0 1px #ddd}
 .imageblock.left{margin:.25em .625em 1.25em 0}
 .imageblock.right{margin:.25em 0 1.25em .625em}
 .imageblock>.title{margin-bottom:0}
@@ -387,7 +385,7 @@ a span.icon>.fa{cursor:inherit}
 .admonitionblock td.icon .icon-warning::before{content:"\f071";color:#bf6900}
 .admonitionblock td.icon .icon-caution::before{content:"\f06d";color:#bf3400}
 .admonitionblock td.icon .icon-important::before{content:"\f06a";color:#bf0000}
-.conum[data-value]{display:inline-block;color:#fff!important;background:rgba(0,0,0,.8);-webkit-border-radius:50%;border-radius:50%;text-align:center;font-size:.75em;width:1.67em;height:1.67em;line-height:1.67em;font-family:"Open Sans","DejaVu Sans",sans-serif;font-style:normal;font-weight:bold}
+.conum[data-value]{display:inline-block;color:#fff!important;background:rgba(0,0,0,.8);border-radius:50%;text-align:center;font-size:.75em;width:1.67em;height:1.67em;line-height:1.67em;font-family:"Open Sans","DejaVu Sans",sans-serif;font-style:normal;font-weight:bold}
 .conum[data-value] *{color:#fff!important}
 .conum[data-value]+b{display:none}
 .conum[data-value]::after{content:attr(data-value)}
@@ -395,19 +393,20 @@ pre .conum[data-value]{position:relative;top:-.125em}
 b.conum *{color:inherit!important}
 .conum:not([data-value]):empty{display:none}
 dt,th.tableblock,td.content,div.footnote{text-rendering:optimizeLegibility}
-h1,h2,p,td.content,span.alt{letter-spacing:-.01em}
+h1,h2,p,td.content,span.alt,summary{letter-spacing:-.01em}
 p strong,td.content strong,div.footnote strong{letter-spacing:-.005em}
-p,blockquote,dt,td.content,span.alt{font-size:1.0625rem}
+p,blockquote,dt,td.content,span.alt,summary{font-size:1.0625rem}
 p{margin-bottom:1.25rem}
 .sidebarblock p,.sidebarblock dt,.sidebarblock td.content,p.tableblock{font-size:1em}
-.exampleblock>.content{background:#fffef7;border-color:#e0e0dc;-webkit-box-shadow:0 1px 4px #e0e0dc;box-shadow:0 1px 4px #e0e0dc}
+.exampleblock>.content{background:#fffef7;border-color:#e0e0dc;box-shadow:0 1px 4px #e0e0dc}
 .print-only{display:none!important}
 @page{margin:1.25cm .75cm}
-@media print{*{-webkit-box-shadow:none!important;box-shadow:none!important;text-shadow:none!important}
+@media print{*{box-shadow:none!important;text-shadow:none!important}
 html{font-size:80%}
 a{color:inherit!important;text-decoration:underline!important}
 a.bare,a[href^="#"],a[href^="mailto:"]{text-decoration:none!important}
 a[href^="http:"]:not(.bare)::after,a[href^="https:"]:not(.bare)::after{content:"(" attr(href) ")";display:inline-block;font-size:.875em;padding-left:.25em}
+abbr[title]{border-bottom:1px dotted}
 abbr[title]::after{content:" (" attr(title) ")"}
 pre,blockquote,tr,img,object,svg{page-break-inside:avoid}
 thead{display:table-header-group}
@@ -431,7 +430,7 @@ body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-b
 .print-only{display:block!important}
 .hide-for-print{display:none!important}
 .show-for-print{display:inherit!important}}
-@media print,amzn-kf8{#header>h1:first-child{margin-top:1.25rem}
+@media amzn-kf8,print{#header>h1:first-child{margin-top:1.25rem}
 .sect1{padding:0!important}
 .sect1+.sect1{border:0}
 #footer{background:none}
@@ -446,9 +445,9 @@ body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-b
 <h1>The OpenXR Specification</h1>
 <div class="details">
 <span id="author" class="author">Copyright (c) 2017-2021, The Khronos Group Inc.</span><br>
-<span id="revnumber">version 1.0.18,</span>
-<span id="revdate">Wed, 04 Aug 2021 04:44:59 +0000</span>
-<br><span id="revremark">from git branch:  commit: 864bd08fafb489e37b495c22f3f90277a647928e</span>
+<span id="revnumber">version 1.0.19,</span>
+<span id="revdate">Fri, 15 Oct 2021 23:02:17 +0000</span>
+<br><span id="revremark">from git branch: main commit: 808fdcd5fbf02c9f4b801126489b73d902495ad9</span>
 </div>
 <div id="toc" class="toc2">
 <div id="toctitle">Table of Contents</div>
@@ -607,35 +606,38 @@ body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-b
 <li><a href="#XR_FB_foveation">12.42. XR_FB_foveation</a></li>
 <li><a href="#XR_FB_foveation_configuration">12.43. XR_FB_foveation_configuration</a></li>
 <li><a href="#XR_FB_foveation_vulkan">12.44. XR_FB_foveation_vulkan</a></li>
-<li><a href="#XR_FB_swapchain_update_state">12.45. XR_FB_swapchain_update_state</a></li>
-<li><a href="#XR_FB_swapchain_update_state_android_surface">12.46. XR_FB_swapchain_update_state_android_surface</a></li>
-<li><a href="#XR_FB_swapchain_update_state_opengl_es">12.47. XR_FB_swapchain_update_state_opengl_es</a></li>
-<li><a href="#XR_FB_swapchain_update_state_vulkan">12.48. XR_FB_swapchain_update_state_vulkan</a></li>
-<li><a href="#XR_HTC_vive_cosmos_controller_interaction">12.49. XR_HTC_vive_cosmos_controller_interaction</a></li>
-<li><a href="#XR_HUAWEI_controller_interaction">12.50. XR_HUAWEI_controller_interaction</a></li>
-<li><a href="#XR_MND_headless">12.51. XR_MND_headless</a></li>
-<li><a href="#XR_MSFT_composition_layer_reprojection">12.52. XR_MSFT_composition_layer_reprojection</a></li>
-<li><a href="#XR_MSFT_controller_model">12.53. XR_MSFT_controller_model</a></li>
-<li><a href="#XR_MSFT_first_person_observer">12.54. XR_MSFT_first_person_observer</a></li>
-<li><a href="#XR_MSFT_hand_interaction">12.55. XR_MSFT_hand_interaction</a></li>
-<li><a href="#XR_MSFT_hand_tracking_mesh">12.56. XR_MSFT_hand_tracking_mesh</a></li>
-<li><a href="#XR_MSFT_holographic_window_attachment">12.57. XR_MSFT_holographic_window_attachment</a></li>
-<li><a href="#XR_MSFT_perception_anchor_interop">12.58. XR_MSFT_perception_anchor_interop</a></li>
-<li><a href="#XR_MSFT_scene_understanding">12.59. XR_MSFT_scene_understanding</a></li>
-<li><a href="#XR_MSFT_scene_understanding_serialization">12.60. XR_MSFT_scene_understanding_serialization</a></li>
-<li><a href="#XR_MSFT_secondary_view_configuration">12.61. XR_MSFT_secondary_view_configuration</a></li>
-<li><a href="#XR_MSFT_spatial_anchor">12.62. XR_MSFT_spatial_anchor</a></li>
-<li><a href="#XR_MSFT_spatial_anchor_export_preview">12.63. XR_MSFT_spatial_anchor_export_preview</a></li>
-<li><a href="#XR_MSFT_spatial_anchor_persistence">12.64. XR_MSFT_spatial_anchor_persistence</a></li>
-<li><a href="#XR_MSFT_spatial_graph_bridge">12.65. XR_MSFT_spatial_graph_bridge</a></li>
-<li><a href="#XR_MSFT_unbounded_reference_space">12.66. XR_MSFT_unbounded_reference_space</a></li>
-<li><a href="#XR_OCULUS_android_session_state_enable">12.67. XR_OCULUS_android_session_state_enable</a></li>
-<li><a href="#XR_OCULUS_audio_device_guid">12.68. XR_OCULUS_audio_device_guid</a></li>
-<li><a href="#XR_VALVE_analog_threshold">12.69. XR_VALVE_analog_threshold</a></li>
-<li><a href="#XR_VARJO_composition_layer_depth_test">12.70. XR_VARJO_composition_layer_depth_test</a></li>
-<li><a href="#XR_VARJO_environment_depth_estimation">12.71. XR_VARJO_environment_depth_estimation</a></li>
-<li><a href="#XR_VARJO_foveated_rendering">12.72. XR_VARJO_foveated_rendering</a></li>
-<li><a href="#XR_VARJO_quad_views">12.73. XR_VARJO_quad_views</a></li>
+<li><a href="#XR_FB_hand_tracking_aim">12.45. XR_FB_hand_tracking_aim</a></li>
+<li><a href="#XR_FB_hand_tracking_capsules">12.46. XR_FB_hand_tracking_capsules</a></li>
+<li><a href="#XR_FB_hand_tracking_mesh">12.47. XR_FB_hand_tracking_mesh</a></li>
+<li><a href="#XR_FB_space_warp">12.48. XR_FB_space_warp</a></li>
+<li><a href="#XR_FB_swapchain_update_state">12.49. XR_FB_swapchain_update_state</a></li>
+<li><a href="#XR_FB_swapchain_update_state_android_surface">12.50. XR_FB_swapchain_update_state_android_surface</a></li>
+<li><a href="#XR_FB_swapchain_update_state_opengl_es">12.51. XR_FB_swapchain_update_state_opengl_es</a></li>
+<li><a href="#XR_FB_swapchain_update_state_vulkan">12.52. XR_FB_swapchain_update_state_vulkan</a></li>
+<li><a href="#XR_HTC_vive_cosmos_controller_interaction">12.53. XR_HTC_vive_cosmos_controller_interaction</a></li>
+<li><a href="#XR_HUAWEI_controller_interaction">12.54. XR_HUAWEI_controller_interaction</a></li>
+<li><a href="#XR_MND_headless">12.55. XR_MND_headless</a></li>
+<li><a href="#XR_MSFT_composition_layer_reprojection">12.56. XR_MSFT_composition_layer_reprojection</a></li>
+<li><a href="#XR_MSFT_controller_model">12.57. XR_MSFT_controller_model</a></li>
+<li><a href="#XR_MSFT_first_person_observer">12.58. XR_MSFT_first_person_observer</a></li>
+<li><a href="#XR_MSFT_hand_interaction">12.59. XR_MSFT_hand_interaction</a></li>
+<li><a href="#XR_MSFT_hand_tracking_mesh">12.60. XR_MSFT_hand_tracking_mesh</a></li>
+<li><a href="#XR_MSFT_holographic_window_attachment">12.61. XR_MSFT_holographic_window_attachment</a></li>
+<li><a href="#XR_MSFT_perception_anchor_interop">12.62. XR_MSFT_perception_anchor_interop</a></li>
+<li><a href="#XR_MSFT_scene_understanding">12.63. XR_MSFT_scene_understanding</a></li>
+<li><a href="#XR_MSFT_scene_understanding_serialization">12.64. XR_MSFT_scene_understanding_serialization</a></li>
+<li><a href="#XR_MSFT_secondary_view_configuration">12.65. XR_MSFT_secondary_view_configuration</a></li>
+<li><a href="#XR_MSFT_spatial_anchor">12.66. XR_MSFT_spatial_anchor</a></li>
+<li><a href="#XR_MSFT_spatial_anchor_persistence">12.67. XR_MSFT_spatial_anchor_persistence</a></li>
+<li><a href="#XR_MSFT_spatial_graph_bridge">12.68. XR_MSFT_spatial_graph_bridge</a></li>
+<li><a href="#XR_MSFT_unbounded_reference_space">12.69. XR_MSFT_unbounded_reference_space</a></li>
+<li><a href="#XR_OCULUS_android_session_state_enable">12.70. XR_OCULUS_android_session_state_enable</a></li>
+<li><a href="#XR_OCULUS_audio_device_guid">12.71. XR_OCULUS_audio_device_guid</a></li>
+<li><a href="#XR_VALVE_analog_threshold">12.72. XR_VALVE_analog_threshold</a></li>
+<li><a href="#XR_VARJO_composition_layer_depth_test">12.73. XR_VARJO_composition_layer_depth_test</a></li>
+<li><a href="#XR_VARJO_environment_depth_estimation">12.74. XR_VARJO_environment_depth_estimation</a></li>
+<li><a href="#XR_VARJO_foveated_rendering">12.75. XR_VARJO_foveated_rendering</a></li>
+<li><a href="#XR_VARJO_quad_views">12.76. XR_VARJO_quad_views</a></li>
 </ul>
 </li>
 <li><a href="#provisional-extension-appendices-list">13. List of Provisional Extensions</a>
@@ -1249,10 +1251,10 @@ externally synchronize the object handle parameter and any child handles.</p>
 <p>The <code>anchor</code> parameter, and any child handles, in <a href="#xrDestroySpatialAnchorMSFT">xrDestroySpatialAnchorMSFT</a></p>
 </li>
 <li>
-<p>The <code>handTracker</code> parameter, and any child handles, in <a href="#xrDestroyHandTrackerEXT">xrDestroyHandTrackerEXT</a></p>
+<p>The <code>nodeBinding</code> parameter, and any child handles, in <a href="#xrDestroySpatialGraphStaticNodeBindingMSFT">xrDestroySpatialGraphStaticNodeBindingMSFT</a></p>
 </li>
 <li>
-<p>The <code>neighborhoodDataStream</code> parameter, and any child handles, in <a href="#xrDestroySpatialAnchorNeighborhoodDataStreamMSFT">xrDestroySpatialAnchorNeighborhoodDataStreamMSFT</a></p>
+<p>The <code>handTracker</code> parameter, and any child handles, in <a href="#xrDestroyHandTrackerEXT">xrDestroyHandTrackerEXT</a></p>
 </li>
 <li>
 <p>The <code>sceneObserver</code> parameter, and any child handles, in <a href="#xrDestroySceneObserverMSFT">xrDestroySceneObserverMSFT</a></p>
@@ -2022,9 +2024,6 @@ All run time error codes are negative values.</p>
     XR_ERROR_COLOR_SPACE_UNSUPPORTED_FB = -1000108000,
     XR_ERROR_SPATIAL_ANCHOR_NAME_NOT_FOUND_MSFT = -1000142001,
     XR_ERROR_SPATIAL_ANCHOR_NAME_INVALID_MSFT = -1000142002,
-    XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT = 1000062000,
-    XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT = -1000062000,
-    XR_ERROR_SPATIAL_ANCHOR_SUFFICIENCY_QUERY_FAILED_MSFT = -1000062001,
     XR_RESULT_MAX_ENUM = 0x7FFFFFFF
 } XrResult;</code></pre>
 </div>
@@ -2097,10 +2096,6 @@ supported by this function&#8217;s parent handle but not at this moment.</p>
 <td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock"><code>XR_FRAME_DISCARDED</code></p></td>
 <td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock">A frame has been discarded from composition.</p></td>
 </tr>
-<tr>
-<td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock"><code>XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT</code></p></td>
-<td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock">All the current contents of the output stream have been read successfully (Added by the <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension)</p></td>
-</tr>
 </tbody>
 </table>
 <div id="fundamentals-errorcodes" class="paragraph">
@@ -2374,14 +2369,6 @@ supported by this function&#8217;s parent handle but not at this moment.</p>
 <td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock"><code>XR_ERROR_SPATIAL_ANCHOR_NAME_INVALID_MSFT</code></p></td>
 <td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock">The spatial anchor name provided was not valid (Added by the <code><a href="#XR_MSFT_spatial_anchor_persistence">XR_MSFT_spatial_anchor_persistence</a></code> extension)</p></td>
 </tr>
-<tr>
-<td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock"><code>XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT</code></p></td>
-<td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock">Unable to export the spatial anchor (Added by the <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension)</p></td>
-</tr>
-<tr>
-<td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock"><code>XR_ERROR_SPATIAL_ANCHOR_SUFFICIENCY_QUERY_FAILED_MSFT</code></p></td>
-<td class="tableblock halign-left valign-top" style="background-color: white;"><p class="tableblock">Unable to query the export sufficiency of the spatial anchor (Added by the <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension)</p></td>
-</tr>
 </tbody>
 </table>
 </div>
@@ -2562,7 +2549,7 @@ object handle type <strong class="purple">may</strong> be provided to indicate i
     XR_OBJECT_TYPE_SCENE_MSFT = 1000097001,
     XR_OBJECT_TYPE_FOVEATION_PROFILE_FB = 1000114000,
     XR_OBJECT_TYPE_SPATIAL_ANCHOR_STORE_CONNECTION_MSFT = 1000142000,
-    XR_OBJECT_TYPE_SPATIAL_ANCHOR_NEIGHBORHOOD_DATA_STREAM_MSFT = 1000062000,
+    XR_OBJECT_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_MSFT = 1000049000,
     XR_OBJECT_TYPE_MAX_ENUM = 0x7FFFFFFF
 } XrObjectType;</code></pre>
 </div>
@@ -6264,7 +6251,7 @@ specifying system tracking properties.</p>
 <p><a id="VUID-XrSystemProperties-type-type" href="#VUID-XrSystemProperties-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_SYSTEM_PROPERTIES</code></p>
 </li>
 <li>
-<p><a id="VUID-XrSystemProperties-next-next" href="#VUID-XrSystemProperties-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrSystemEyeGazeInteractionPropertiesEXT">XrSystemEyeGazeInteractionPropertiesEXT</a>, <a href="#XrSystemFoveatedRenderingPropertiesVARJO">XrSystemFoveatedRenderingPropertiesVARJO</a>, <a href="#XrSystemHandTrackingMeshPropertiesMSFT">XrSystemHandTrackingMeshPropertiesMSFT</a>, <a href="#XrSystemHandTrackingPropertiesEXT">XrSystemHandTrackingPropertiesEXT</a></p>
+<p><a id="VUID-XrSystemProperties-next-next" href="#VUID-XrSystemProperties-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrSystemEyeGazeInteractionPropertiesEXT">XrSystemEyeGazeInteractionPropertiesEXT</a>, <a href="#XrSystemFoveatedRenderingPropertiesVARJO">XrSystemFoveatedRenderingPropertiesVARJO</a>, <a href="#XrSystemHandTrackingMeshPropertiesMSFT">XrSystemHandTrackingMeshPropertiesMSFT</a>, <a href="#XrSystemHandTrackingPropertiesEXT">XrSystemHandTrackingPropertiesEXT</a>, <a href="#XrSystemSpaceWarpPropertiesFB">XrSystemSpaceWarpPropertiesFB</a></p>
 </li>
 </ul>
 </div>
@@ -14598,6 +14585,9 @@ generic layer data stored in an <a href="#XrSwapchainSubImage">XrSwapchainSubIma
 the image to use, in pixels.
 It also implicitly defines the transform from normalized image coordinates
 into pixel coordinates.
+The coordinate origin depends on which graphics API is being used.
+See the graphics API extension details for more information on the
+coordinate origin definition.
 Note that the compositor <strong class="purple">may</strong> bleed in pixels from outside the bounds in
 some cases, for instance due to mipmapping.</p>
 </li>
@@ -14808,7 +14798,7 @@ In the case that two submitted views within a single layer overlap, they
 <p><a id="VUID-XrCompositionLayerProjectionView-type-type" href="#VUID-XrCompositionLayerProjectionView-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_COMPOSITION_LAYER_PROJECTION_VIEW</code></p>
 </li>
 <li>
-<p><a id="VUID-XrCompositionLayerProjectionView-next-next" href="#VUID-XrCompositionLayerProjectionView-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrCompositionLayerDepthInfoKHR">XrCompositionLayerDepthInfoKHR</a></p>
+<p><a id="VUID-XrCompositionLayerProjectionView-next-next" href="#VUID-XrCompositionLayerProjectionView-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrCompositionLayerDepthInfoKHR">XrCompositionLayerDepthInfoKHR</a>, <a href="#XrCompositionLayerSpaceWarpInfoFB">XrCompositionLayerSpaceWarpInfoFB</a></p>
 </li>
 <li>
 <p><a id="VUID-XrCompositionLayerProjectionView-subImage-parameter" href="#VUID-XrCompositionLayerProjectionView-subImage-parameter"></a> <code>subImage</code> <strong class="purple">must</strong> be a valid <a href="#XrSwapchainSubImage">XrSwapchainSubImage</a> structure</p>
@@ -16556,7 +16546,7 @@ application&#8217;s suggested bindings for the specified interaction profile.</p
 <p><a id="VUID-XrInteractionProfileSuggestedBinding-type-type" href="#VUID-XrInteractionProfileSuggestedBinding-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_INTERACTION_PROFILE_SUGGESTED_BINDING</code></p>
 </li>
 <li>
-<p><a id="VUID-XrInteractionProfileSuggestedBinding-next-next" href="#VUID-XrInteractionProfileSuggestedBinding-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrBindingModificationsKHR">XrBindingModificationsKHR</a>, <a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnalogThresholdVALVE</a></p>
+<p><a id="VUID-XrInteractionProfileSuggestedBinding-next-next" href="#VUID-XrInteractionProfileSuggestedBinding-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrBindingModificationsKHR">XrBindingModificationsKHR</a></p>
 </li>
 <li>
 <p><a id="VUID-XrInteractionProfileSuggestedBinding-suggestedBindings-parameter" href="#VUID-XrInteractionProfileSuggestedBinding-suggestedBindings-parameter"></a> <code>suggestedBindings</code> <strong class="purple">must</strong> be a pointer to an array of <code>countSuggestedBindings</code> valid <a href="#XrActionSuggestedBinding">XrActionSuggestedBinding</a> structures</p>
@@ -17030,8 +17020,10 @@ In all cases the runtime <strong class="purple">must</strong> not change the res
 </div>
 <div class="paragraph">
 <p>When <code>xrGetActionState*</code> or haptic output functions are called while the
-session <a href="#session_not_running">is not running</a>, the runtime <strong class="purple">must</strong> set the
-<code>isActive</code> value to <code>XR_FALSE</code> and suppress all haptic output.</p>
+session <a href="#session_focused">is not focused</a>, the runtime <strong class="purple">must</strong> set the
+<code>isActive</code> value to <code>XR_FALSE</code> and suppress all haptic output.
+Furthermore, the runtime should stop all in-progress haptic events when a
+session loses focus.</p>
 </div>
 <div class="paragraph">
 <p>When retrieving action state, <code>lastChangeTime</code> <strong class="purple">must</strong> be set to the
@@ -18037,7 +18029,7 @@ cancel all preceding incomplete haptic events on that action.</p>
 </div>
 <div class="paragraph">
 <p>Output action requests <strong class="purple">must</strong> be discarded and have no effect on hardware if
-the application&#8217;s session is not active.</p>
+the application&#8217;s session is not focused.</p>
 </div>
 <div class="paragraph">
 <p>Output action requests for an action in an action set never attached to the
@@ -18094,6 +18086,10 @@ If an appropriate device is unavailable the runtime <strong class="purple">may</
 for haptic feedback.</p>
 </div>
 <div class="paragraph">
+<p>If <code>session</code> is not focused, the runtime <strong class="purple">must</strong> return
+<code>XR_SESSION_NOT_FOCUSED</code>, and not trigger a haptic event.</p>
+</div>
+<div class="paragraph">
 <p>If another haptic event from this session is currently happening on the
 device bound to this action, the runtime <strong class="purple">must</strong> interrupt that other event
 and replace it with the new one.</p>
@@ -18131,6 +18127,9 @@ and replace it with the new one.</p>
 <li>
 <p><code>XR_SESSION_LOSS_PENDING</code></p>
 </li>
+<li>
+<p><code>XR_SESSION_NOT_FOCUSED</code></p>
+</li>
 </ul>
 </div>
 </dd>
@@ -18368,6 +18367,10 @@ provide action and subaction path information.</p>
 <p>If a haptic event from this <a href="#XrAction">XrAction</a> is in progress, when this
 function is called the runtime <strong class="purple">must</strong> stop that event.</p>
 </div>
+<div class="paragraph">
+<p>If <code>session</code> is not focused, the runtime <strong class="purple">must</strong> return
+<code>XR_SESSION_NOT_FOCUSED</code>.</p>
+</div>
 <div class="sidebarblock">
 <div class="content">
 <div class="title">Valid Usage (Implicit)</div>
@@ -18398,6 +18401,9 @@ function is called the runtime <strong class="purple">must</strong> stop that ev
 <li>
 <p><code>XR_SESSION_LOSS_PENDING</code></p>
 </li>
+<li>
+<p><code>XR_SESSION_NOT_FOCUSED</code></p>
+</li>
 </ul>
 </div>
 </dd>
@@ -19302,6 +19308,18 @@ E.g. <code>Trigger</code>.</p>
 <p><code><a href="#XR_FB_foveation_vulkan">XR_FB_foveation_vulkan</a></code></p>
 </li>
 <li>
+<p><code><a href="#XR_FB_hand_tracking_aim">XR_FB_hand_tracking_aim</a></code></p>
+</li>
+<li>
+<p><code><a href="#XR_FB_hand_tracking_capsules">XR_FB_hand_tracking_capsules</a></code></p>
+</li>
+<li>
+<p><code><a href="#XR_FB_hand_tracking_mesh">XR_FB_hand_tracking_mesh</a></code></p>
+</li>
+<li>
+<p><code><a href="#XR_FB_space_warp">XR_FB_space_warp</a></code></p>
+</li>
+<li>
 <p><code><a href="#XR_FB_swapchain_update_state">XR_FB_swapchain_update_state</a></code></p>
 </li>
 <li>
@@ -19356,9 +19374,6 @@ E.g. <code>Trigger</code>.</p>
 <p><code><a href="#XR_MSFT_spatial_anchor">XR_MSFT_spatial_anchor</a></code></p>
 </li>
 <li>
-<p><code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code></p>
-</li>
-<li>
 <p><code><a href="#XR_MSFT_spatial_anchor_persistence">XR_MSFT_spatial_anchor_persistence</a></code></p>
 </li>
 <li>
@@ -19386,11 +19401,11 @@ E.g. <code>Trigger</code>.</p>
 <p><code><a href="#XR_VARJO_foveated_rendering">XR_VARJO_foveated_rendering</a></code></p>
 </li>
 <li>
-<p><code><a href="#XR_VARJO_quad_views">XR_VARJO_quad_views</a></code>
-&lt;&lt;&lt;</p>
+<p><code><a href="#XR_VARJO_quad_views">XR_VARJO_quad_views</a></code></p>
 </li>
 </ul>
 </div>
+<div style="page-break-after: always;"></div>
 <div class="sect2">
 <h3 id="XR_KHR_android_create_instance"><a class="anchor" href="#XR_KHR_android_create_instance"></a>12.1. XR_KHR_android_create_instance</h3>
 <div class="dlist">
@@ -20360,7 +20375,7 @@ the specified interaction profile.</p>
 <p><a id="VUID-XrBindingModificationsKHR-next-next" href="#VUID-XrBindingModificationsKHR-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
 </li>
 <li>
-<p><a id="VUID-XrBindingModificationsKHR-bindingModifications-parameter" href="#VUID-XrBindingModificationsKHR-bindingModifications-parameter"></a> If <code>bindingModificationCount</code> is not <code>0</code>, <code>bindingModifications</code> <strong class="purple">must</strong> be a pointer to an array of <code>bindingModificationCount</code> valid <a href="#XrBindingModificationBaseHeaderKHR">XrBindingModificationBaseHeaderKHR</a>-based structures</p>
+<p><a id="VUID-XrBindingModificationsKHR-bindingModifications-parameter" href="#VUID-XrBindingModificationsKHR-bindingModifications-parameter"></a> If <code>bindingModificationCount</code> is not <code>0</code>, <code>bindingModifications</code> <strong class="purple">must</strong> be a pointer to an array of <code>bindingModificationCount</code> valid <a href="#XrBindingModificationBaseHeaderKHR">XrBindingModificationBaseHeaderKHR</a>-based structures. See also: <a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnalogThresholdVALVE</a></p>
 </li>
 </ul>
 </div>
@@ -33343,7 +33358,7 @@ locations will be represented.</p>
 <p><a id="VUID-XrHandJointsLocateInfoEXT-type-type" href="#VUID-XrHandJointsLocateInfoEXT-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_HAND_JOINTS_LOCATE_INFO_EXT</code></p>
 </li>
 <li>
-<p><a id="VUID-XrHandJointsLocateInfoEXT-next-next" href="#VUID-XrHandJointsLocateInfoEXT-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrHandJointsMotionRangeInfoEXT">XrHandJointsMotionRangeInfoEXT</a></p>
+<p><a id="VUID-XrHandJointsLocateInfoEXT-next-next" href="#VUID-XrHandJointsLocateInfoEXT-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a>. See also: <a href="#XrHandJointsMotionRangeInfoEXT">XrHandJointsMotionRangeInfoEXT</a>, <a href="#XrHandTrackingAimStateFB">XrHandTrackingAimStateFB</a>, <a href="#XrHandTrackingCapsulesStateFB">XrHandTrackingCapsulesStateFB</a>, <a href="#XrHandTrackingScaleFB">XrHandTrackingScaleFB</a></p>
 </li>
 <li>
 <p><a id="VUID-XrHandJointsLocateInfoEXT-baseSpace-parameter" href="#VUID-XrHandJointsLocateInfoEXT-baseSpace-parameter"></a> <code>baseSpace</code> <strong class="purple">must</strong> be a valid <a href="#XrSpace">XrSpace</a> handle</p>
@@ -35721,6 +35736,10 @@ of <a href="#XrViewConfigurationView">XrViewConfigurationView</a>.</p>
 </ul>
 </div>
 </dd>
+</dl>
+</div>
+<div class="dlist">
+<dl>
 <dt class="hdlist1"><strong>Last Modified Date</strong></dt>
 <dd>
 <p>2019-12-16</p>
@@ -35742,13 +35761,11 @@ Lachlan Ford, Microsoft<br></p>
 </div>
 <div class="paragraph">
 <p>To minimize opportunities for malicious manipulation, a common practice on
-the Windows OS is to isolate the application process in an [AppContainer
-execution environment]
-(<a href="https://docs.microsoft.com/en-us/windows/win32/secauthz/appcontainer-isolation" class="bare">https://docs.microsoft.com/en-us/windows/win32/secauthz/appcontainer-isolation</a>).
+the Windows OS is to isolate the application process in an
+<a href="https://docs.microsoft.com/en-us/windows/win32/secauthz/appcontainer-isolation">AppContainer execution environment</a>.
 In order for a runtime to work properly in such an application process, the
-runtime <strong class="purple">must</strong> properly [set ACL to device resources and cross process
-resources]
-(<a href="https://docs.microsoft.com/en-us/windows/win32/secauthz/implementing-an-appcontainer" class="bare">https://docs.microsoft.com/en-us/windows/win32/secauthz/implementing-an-appcontainer</a>).</p>
+runtime <strong class="purple">must</strong> properly <a href="https://docs.microsoft.com/en-us/windows/win32/secauthz/implementing-an-appcontainer">set ACL to device resources
+and cross process resources</a>.</p>
 </div>
 <div class="paragraph">
 <p>An application running in an AppContainer process <strong class="purple">can</strong> request for a runtime
@@ -39200,7 +39217,1410 @@ No such structures are defined in core OpenXR or this extension.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_FB_swapchain_update_state"><a class="anchor" href="#XR_FB_swapchain_update_state"></a>12.45. XR_FB_swapchain_update_state</h3>
+<h3 id="XR_FB_hand_tracking_aim"><a class="anchor" href="#XR_FB_hand_tracking_aim"></a>12.45. XR_FB_hand_tracking_aim</h3>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><strong>Name String</strong></dt>
+<dd>
+<p><code>XR_FB_hand_tracking_aim</code></p>
+</dd>
+<dt class="hdlist1"><strong>Extension Type</strong></dt>
+<dd>
+<p>Instance extension</p>
+</dd>
+<dt class="hdlist1"><strong>Registered Extension Number</strong></dt>
+<dd>
+<p>112</p>
+</dd>
+<dt class="hdlist1"><strong>Revision</strong></dt>
+<dd>
+<p>1</p>
+</dd>
+<dt class="hdlist1"><strong>Extension and Version Dependencies</strong></dt>
+<dd>
+<div class="ulist">
+<ul>
+<li>
+<p>Requires OpenXR 1.0</p>
+</li>
+<li>
+<p>Requires <code><a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a></code></p>
+</li>
+</ul>
+</div>
+</dd>
+<dt class="hdlist1"><strong>Contributors</strong></dt>
+<dd>
+<p>Federico Schliemann, Facebook<br>
+James Hillery, Facebook<br>
+Gloria Kennickell, Facebook</p>
+</dd>
+</dl>
+</div>
+<div class="paragraph">
+<p><strong>Overview</strong></p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a> extension provides a list of hand joint poses
+which represent the current configuration of the tracked hands.
+This extension adds a layer of gesture recognition that is used by the
+system.</p>
+</div>
+<div class="paragraph">
+<p>This extension allows:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>An application to get a set of basic gesture states for the hand when
+using the <a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a> extension.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Object Types</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Flag Types</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div id="XrHandTrackingAimFlagsFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef XrFlags64 XrHandTrackingAimFlagsFB;</code></pre>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock">
+<div class="content">
+<div id="XrHandTrackingAimFlagBitsFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">// Flag bits for XrHandTrackingAimFlagsFB
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_COMPUTED_BIT_FB = 0x00000001;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_VALID_BIT_FB = 0x00000002;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_INDEX_PINCHING_BIT_FB = 0x00000004;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_MIDDLE_PINCHING_BIT_FB = 0x00000008;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_RING_PINCHING_BIT_FB = 0x00000010;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_LITTLE_PINCHING_BIT_FB = 0x00000020;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_SYSTEM_GESTURE_BIT_FB = 0x00000040;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_DOMINANT_HAND_BIT_FB = 0x00000080;
+static const XrHandTrackingAimFlagsFB XR_HAND_TRACKING_AIM_MENU_PRESSED_BIT_FB = 0x00000100;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Flag Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_COMPUTED_BIT_FB</code>&#8201;&#8212;&#8201;Aiming data is computed from additional sources beyond the hand data in the base structure</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_VALID_BIT_FB</code>&#8201;&#8212;&#8201;Aiming data is valid</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_INDEX_PINCHING_BIT_FB</code>&#8201;&#8212;&#8201;Index finger pinch discrete signal</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_MIDDLE_PINCHING_BIT_FB</code>&#8201;&#8212;&#8201;Middle finger pinch discrete signal</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_RING_PINCHING_BIT_FB</code>&#8201;&#8212;&#8201;Ring finger pinch discrete signal</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_LITTLE_PINCHING_BIT_FB</code>&#8201;&#8212;&#8201;Little finger pinch discrete signal</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_SYSTEM_GESTURE_BIT_FB</code>&#8201;&#8212;&#8201;System gesture is active</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_DOMINANT_HAND_BIT_FB</code>&#8201;&#8212;&#8201;Hand is currently marked as dominant for the system</p>
+</li>
+<li>
+<p><code>XR_HAND_TRACKING_AIM_MENU_PRESSED_BIT_FB</code>&#8201;&#8212;&#8201;System menu gesture is active</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>New Enum Constants</strong></p>
+</div>
+<div class="paragraph">
+<p><a href="#XrStructureType">XrStructureType</a> enumeration is extended with:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_TYPE_HAND_TRACKING_AIM_STATE_FB</code></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Enums</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Structures</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p><a href="#XrHandTrackingAimStateFB">XrHandTrackingAimStateFB</a> <strong class="purple">can</strong> be provided in the <code>next</code> chain of
+<a href="#XrHandJointsLocateInfoEXT">XrHandJointsLocateInfoEXT</a> when calling <a href="#xrLocateHandJointsEXT">xrLocateHandJointsEXT</a> to
+request aiming gesture information associated with this hand.</p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XrHandTrackingAimStateFB">XrHandTrackingAimStateFB</a> structure is defined as:</p>
+</div>
+<div id="XrHandTrackingAimStateFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrHandTrackingAimStateFB {
+    XrStructureType             type;
+    void*                       next;
+    XrHandTrackingAimFlagsFB    status;
+    XrPosef                     aimPose;
+    float                       pinchStrengthIndex;
+    float                       pinchStrengthMiddle;
+    float                       pinchStrengthRing;
+    float                       pinchStrengthLittle;
+} XrHandTrackingAimStateFB;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
+</li>
+<li>
+<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure
+chain.
+No such structures are defined in core OpenXR or this extension.</p>
+</li>
+<li>
+<p><code>status</code> is a bitmask of <a href="#XrHandTrackingAimFlagBitsFB">XrHandTrackingAimFlagBitsFB</a> describing
+the availability and state of other signals.</p>
+</li>
+<li>
+<p><code>aimPose</code> is a system-determined "aim" pose, similar in intent and
+convention to the <a href="#aim-pose">aim poses</a> used with the action system,
+based on hand data.</p>
+</li>
+<li>
+<p><code>pinchStrengthIndex</code> is the current pinching strength for the index
+finger of this hand.
+Range is 0.0 to 1.0, with 1.0 meaning index and thumb are fully touching.</p>
+</li>
+<li>
+<p><code>pinchStrengthMiddle</code> is the current pinching strength for the middle
+finger of this hand.
+Range is 0.0 to 1.0, with 1.0 meaning middle and thumb are fully touching.</p>
+</li>
+<li>
+<p><code>pinchStrengthRing</code> is the current pinching strength for the ring
+finger of this hand.
+Range is 0.0 to 1.0, with 1.0 meaning ring and thumb are fully touching.</p>
+</li>
+<li>
+<p><code>pinchStrengthLittle</code> is the current pinching strength for the little
+finger of this hand.
+Range is 0.0 to 1.0, with 1.0 meaning little and thumb are fully touching.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrHandTrackingAimStateFB-extension-notenabled" href="#VUID-XrHandTrackingAimStateFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_aim">XR_FB_hand_tracking_aim</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrHandTrackingAimStateFB">XrHandTrackingAimStateFB</a></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingAimStateFB-type-type" href="#VUID-XrHandTrackingAimStateFB-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_HAND_TRACKING_AIM_STATE_FB</code></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingAimStateFB-next-next" href="#VUID-XrHandTrackingAimStateFB-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>New Functions</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>Issues</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>Version History</strong></p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Revision 1, 2021-07-07 (Federico Schliemann)</p>
+<div class="ulist">
+<ul>
+<li>
+<p>Initial extension description</p>
+</li>
+</ul>
+</div>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="XR_FB_hand_tracking_capsules"><a class="anchor" href="#XR_FB_hand_tracking_capsules"></a>12.46. XR_FB_hand_tracking_capsules</h3>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><strong>Name String</strong></dt>
+<dd>
+<p><code>XR_FB_hand_tracking_capsules</code></p>
+</dd>
+<dt class="hdlist1"><strong>Extension Type</strong></dt>
+<dd>
+<p>Instance extension</p>
+</dd>
+<dt class="hdlist1"><strong>Registered Extension Number</strong></dt>
+<dd>
+<p>113</p>
+</dd>
+<dt class="hdlist1"><strong>Revision</strong></dt>
+<dd>
+<p>1</p>
+</dd>
+<dt class="hdlist1"><strong>Extension and Version Dependencies</strong></dt>
+<dd>
+<div class="ulist">
+<ul>
+<li>
+<p>Requires OpenXR 1.0</p>
+</li>
+<li>
+<p>Requires <code><a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a></code></p>
+</li>
+</ul>
+</div>
+</dd>
+<dt class="hdlist1"><strong>Contributors</strong></dt>
+<dd>
+<p>Federico Schliemann, Facebook<br>
+James Hillery, Facebook<br>
+Gloria Kennickell, Facebook</p>
+</dd>
+</dl>
+</div>
+<div class="paragraph">
+<p><strong>Overview</strong></p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a> extension provides a list of hand joint poses
+which include a collision sphere for each joint.
+However some physics systems prefer to use capsules as a collision stand in
+for the hands.</p>
+</div>
+<div class="paragraph">
+<p>This extension allows:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>An application to get a list of capsules that represent the volume of the
+hand when using the <a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a> extension.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Object Types</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Flag Types</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Enum Constants</strong></p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_FB_HAND_TRACKING_CAPSULE_POINT_COUNT</code></p>
+</li>
+<li>
+<p><code>XR_FB_HAND_TRACKING_CAPSULE_COUNT</code></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><a href="#XrStructureType">XrStructureType</a> enumeration is extended with:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_TYPE_HAND_TRACKING_CAPSULES_STATE_FB</code></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Enums</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Structures</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p>The <a href="#XrHandCapsuleFB">XrHandCapsuleFB</a> structure is defined as:</p>
+</div>
+<div id="XrHandCapsuleFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrHandCapsuleFB {
+    XrVector3f        points[XR_FB_HAND_TRACKING_CAPSULE_POINT_COUNT];
+    float             radius;
+    XrHandJointEXT    joint;
+} XrHandCapsuleFB;</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>It describes a collision capsule associated with a hand joint.</p>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>points</code> are the two points defining the capsule length.</p>
+</li>
+<li>
+<p><code>radius</code> is the radius of the capsule.</p>
+</li>
+<li>
+<p><code>joint</code> is the hand joint that drives this capsule&#8217;s transform.
+Multiple capsules can be attached to the same joint.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrHandCapsuleFB-extension-notenabled" href="#VUID-XrHandCapsuleFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_capsules">XR_FB_hand_tracking_capsules</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrHandCapsuleFB">XrHandCapsuleFB</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p><a href="#XrHandTrackingCapsulesStateFB">XrHandTrackingCapsulesStateFB</a> <strong class="purple">can</strong> be provided in the <code>next</code> chain
+of <a href="#XrHandJointsLocateInfoEXT">XrHandJointsLocateInfoEXT</a> when calling <a href="#xrLocateHandJointsEXT">xrLocateHandJointsEXT</a>
+to request collision capsule information associated with this hand.</p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XrHandTrackingCapsulesStateFB">XrHandTrackingCapsulesStateFB</a> structure is defined as:</p>
+</div>
+<div id="XrHandTrackingCapsulesStateFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrHandTrackingCapsulesStateFB {
+    XrStructureType    type;
+    void*              next;
+    XrHandCapsuleFB    capsules[XR_FB_HAND_TRACKING_CAPSULE_COUNT];
+} XrHandTrackingCapsulesStateFB;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
+</li>
+<li>
+<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure
+chain.
+No such structures are defined in core OpenXR or this extension.</p>
+</li>
+<li>
+<p><code>capsules</code> is an array of capsules.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrHandTrackingCapsulesStateFB-extension-notenabled" href="#VUID-XrHandTrackingCapsulesStateFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_capsules">XR_FB_hand_tracking_capsules</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrHandTrackingCapsulesStateFB">XrHandTrackingCapsulesStateFB</a></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingCapsulesStateFB-type-type" href="#VUID-XrHandTrackingCapsulesStateFB-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_HAND_TRACKING_CAPSULES_STATE_FB</code></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingCapsulesStateFB-next-next" href="#VUID-XrHandTrackingCapsulesStateFB-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>New Functions</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>Issues</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>Version History</strong></p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Revision 1, 2021-07-07 (Federico Schliemann)</p>
+<div class="ulist">
+<ul>
+<li>
+<p>Initial extension description</p>
+</li>
+</ul>
+</div>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="XR_FB_hand_tracking_mesh"><a class="anchor" href="#XR_FB_hand_tracking_mesh"></a>12.47. XR_FB_hand_tracking_mesh</h3>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><strong>Name String</strong></dt>
+<dd>
+<p><code>XR_FB_hand_tracking_mesh</code></p>
+</dd>
+<dt class="hdlist1"><strong>Extension Type</strong></dt>
+<dd>
+<p>Instance extension</p>
+</dd>
+<dt class="hdlist1"><strong>Registered Extension Number</strong></dt>
+<dd>
+<p>111</p>
+</dd>
+<dt class="hdlist1"><strong>Revision</strong></dt>
+<dd>
+<p>1</p>
+</dd>
+<dt class="hdlist1"><strong>Extension and Version Dependencies</strong></dt>
+<dd>
+<div class="ulist">
+<ul>
+<li>
+<p>Requires OpenXR 1.0</p>
+</li>
+<li>
+<p>Requires <code><a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a></code></p>
+</li>
+</ul>
+</div>
+</dd>
+<dt class="hdlist1"><strong>Contributors</strong></dt>
+<dd>
+<p>Federico Schliemann, Facebook<br>
+James Hillery, Facebook<br>
+Gloria Kennickell, Facebook</p>
+</dd>
+</dl>
+</div>
+<div class="paragraph">
+<p><strong>Overview</strong></p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a> extension provides a list of hand joint poses
+but no mechanism to render a skinned hand mesh.</p>
+</div>
+<div class="paragraph">
+<p>This extension allows:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>An application to get a skinned hand mesh and a bind pose skeleton that
+can be used to render a hand object driven by the joints from the
+<a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a> extension.</p>
+</li>
+<li>
+<p>Control the scale of the hand joints returned by <a href="#XR_EXT_hand_tracking">XR_EXT_hand_tracking</a>.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Object Types</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Flag Types</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Enum Constants</strong></p>
+</div>
+<div class="paragraph">
+<p><a href="#XrStructureType">XrStructureType</a> enumeration is extended with:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_TYPE_HAND_TRACKING_MESH_FB</code></p>
+</li>
+<li>
+<p><code>XR_TYPE_HAND_TRACKING_SCALE_FB</code></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Enums</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>New Structures</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p>The <a href="#XrVector4sFB">XrVector4sFB</a> structure is defined as:</p>
+</div>
+<div id="XrVector4sFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrVector4sFB {
+    int16_t    x;
+    int16_t    y;
+    int16_t    z;
+    int16_t    w;
+} XrVector4sFB;</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>This is a short integer, four component vector type, used for per-vertex
+joint indexing for mesh skinning.</p>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>x</code> is the <code>x</code> component of the vector.</p>
+</li>
+<li>
+<p><code>y</code> is the <code>y</code> component of the vector.</p>
+</li>
+<li>
+<p><code>z</code> is the <code>z</code> component of the vector.</p>
+</li>
+<li>
+<p><code>w</code> is the <code>w</code> component of the vector.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrVector4sFB-extension-notenabled" href="#VUID-XrVector4sFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_mesh">XR_FB_hand_tracking_mesh</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrVector4sFB">XrVector4sFB</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p>The <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a> structure contains three sets of parallel,
+application-allocated arrays: one with per-joint data, one with vertex data,
+and one with index data.</p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a> structure is defined as:</p>
+</div>
+<div id="XrHandTrackingMeshFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrHandTrackingMeshFB {
+    XrStructureType    type;
+    void*              next;
+    uint32_t           jointCapacityInput;
+    uint32_t           jointCountOutput;
+    XrPosef*           jointBindPoses;
+    float*             jointRadii;
+    XrHandJointEXT*    jointParents;
+    uint32_t           vertexCapacityInput;
+    uint32_t           vertexCountOutput;
+    XrVector3f*        vertexPositions;
+    XrVector3f*        vertexNormals;
+    XrVector2f*        vertexUVs;
+    XrVector4sFB*      vertexBlendIndices;
+    XrVector4f*        vertexBlendWeights;
+    uint32_t           indexCapacityInput;
+    uint32_t           indexCountOutput;
+    int16_t*           indices;
+} XrHandTrackingMeshFB;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
+</li>
+<li>
+<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure
+chain.
+No such structures are defined in core OpenXR or this extension.</p>
+</li>
+<li>
+<p><code>jointCapacityInput</code> is the capacity of the joint data arrays in this
+structure, or <code>0</code> to indicate a request to retrieve the required capacity.</p>
+</li>
+<li>
+<p><code>jointCountOutput</code> is filled in by the runtime with the count of joint
+data elements written, or the required capacity in the case that any of
+<code>jointCapacityInput</code>, <code>vertexCapacityInput</code>, or
+<code>indexCapacityInput</code> is <code>0</code>.</p>
+</li>
+<li>
+<p><code>jointBindPoses</code> is an array of poses that matches what is returned by
+<a href="#xrLocateHandJointsEXT">xrLocateHandJointsEXT</a> which describes the hand skeleton&#8217;s bind pose.</p>
+</li>
+<li>
+<p><code>jointRadii</code> is an array of joint radii at bind pose.</p>
+</li>
+<li>
+<p><code>jointParents</code> is an array of joint parents to define a bone hierarchy
+for the hand skeleton.</p>
+</li>
+<li>
+<p><code>vertexCapacityInput</code> is the capacity of the vertex data arrays in
+this structure, or <code>0</code> to indicate a request to retrieve the required
+capacity.</p>
+</li>
+<li>
+<p><code>vertexCountOutput</code> is filled in by the runtime with the count of
+vertex data elements written, or the required capacity in the case that
+any of <code>jointCapacityInput</code>, <code>vertexCapacityInput</code>, or
+<code>indexCapacityInput</code> is <code>0</code>.</p>
+</li>
+<li>
+<p><code>vertexPositions</code> is an array of 3D vertex positions.</p>
+</li>
+<li>
+<p><code>vertexNormals</code> is an array of 3D vertex normals.</p>
+</li>
+<li>
+<p><code>vertexUVs</code> is an array of texture coordinates for this vertex.</p>
+</li>
+<li>
+<p><code>vertexBlendIndices</code> is an array of bone blend indices.</p>
+</li>
+<li>
+<p><code>vertexBlendWeights</code> is an array of bone blend weights.</p>
+</li>
+<li>
+<p><code>indexCapacityInput</code> is the capacity of the index data arrays in this
+structure, or <code>0</code> to indicate a request to retrieve the required capacity.</p>
+</li>
+<li>
+<p><code>indexCountOutput</code> is filled in by the runtime with the count of index
+data elements written, or the required capacity in the case that any of
+<code>jointCapacityInput</code>, <code>vertexCapacityInput</code>, or
+<code>indexCapacityInput</code> is <code>0</code>.</p>
+</li>
+<li>
+<p><code>indices</code> is an array of triangle indices.</p>
+</li>
+<li>
+<p>See the &lt;&lt;buffer-size-parameters&gt; section for a detailed description of
+retrieving the required array sizes in the "struct form" as used here.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p>All arrays are application-allocated, and all <strong class="purple">may</strong> be <code>NULL</code> if any of
+<code>jointCapacityInput</code>, <code>vertexCapacityInput</code>, or
+<code>indexCapacityInput</code> is <code>0</code>.</p>
+</div>
+<div class="paragraph">
+<p>The data in a fully-populated <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a> is immutable during
+the lifetime of the corresponding <a href="#XrInstance">XrInstance</a>, and is intended to be
+retrieved once then used in combination with data changing per-frame
+retrieved from <a href="#xrLocateHandJointsEXT">xrLocateHandJointsEXT</a>.</p>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-extension-notenabled" href="#VUID-XrHandTrackingMeshFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_mesh">XR_FB_hand_tracking_mesh</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-type-type" href="#VUID-XrHandTrackingMeshFB-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_HAND_TRACKING_MESH_FB</code></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-next-next" href="#VUID-XrHandTrackingMeshFB-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-jointBindPoses-parameter" href="#VUID-XrHandTrackingMeshFB-jointBindPoses-parameter"></a> <code>jointBindPoses</code> <strong class="purple">must</strong> be a pointer to an array of <code>jointCapacityInput</code> <a href="#XrPosef">XrPosef</a> structures</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-jointRadii-parameter" href="#VUID-XrHandTrackingMeshFB-jointRadii-parameter"></a> <code>jointRadii</code> <strong class="purple">must</strong> be a pointer to an array of <code>jointCapacityInput</code> <code>float</code> values</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-jointParents-parameter" href="#VUID-XrHandTrackingMeshFB-jointParents-parameter"></a> <code>jointParents</code> <strong class="purple">must</strong> be a pointer to an array of <code>jointCapacityInput</code> <a href="#XrHandJointEXT">XrHandJointEXT</a> values</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-vertexPositions-parameter" href="#VUID-XrHandTrackingMeshFB-vertexPositions-parameter"></a> <code>vertexPositions</code> <strong class="purple">must</strong> be a pointer to an array of <code>vertexCapacityInput</code> <a href="#XrVector3f">XrVector3f</a> structures</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-vertexNormals-parameter" href="#VUID-XrHandTrackingMeshFB-vertexNormals-parameter"></a> <code>vertexNormals</code> <strong class="purple">must</strong> be a pointer to an array of <code>vertexCapacityInput</code> <a href="#XrVector3f">XrVector3f</a> structures</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-vertexUVs-parameter" href="#VUID-XrHandTrackingMeshFB-vertexUVs-parameter"></a> <code>vertexUVs</code> <strong class="purple">must</strong> be a pointer to an array of <code>vertexCapacityInput</code> <a href="#XrVector2f">XrVector2f</a> structures</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-vertexBlendIndices-parameter" href="#VUID-XrHandTrackingMeshFB-vertexBlendIndices-parameter"></a> <code>vertexBlendIndices</code> <strong class="purple">must</strong> be a pointer to an array of <code>vertexCapacityInput</code> <a href="#XrVector4sFB">XrVector4sFB</a> structures</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-vertexBlendWeights-parameter" href="#VUID-XrHandTrackingMeshFB-vertexBlendWeights-parameter"></a> <code>vertexBlendWeights</code> <strong class="purple">must</strong> be a pointer to an array of <code>vertexCapacityInput</code> <a href="#XrVector4f">XrVector4f</a> structures</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-indices-parameter" href="#VUID-XrHandTrackingMeshFB-indices-parameter"></a> <code>indices</code> <strong class="purple">must</strong> be a pointer to an array of <code>indexCapacityInput</code> <code>int16_t</code> values</p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-jointCapacityInput-arraylength" href="#VUID-XrHandTrackingMeshFB-jointCapacityInput-arraylength"></a> The <code>jointCapacityInput</code> parameter <strong class="purple">must</strong> be greater than <code>0</code></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-vertexCapacityInput-arraylength" href="#VUID-XrHandTrackingMeshFB-vertexCapacityInput-arraylength"></a> The <code>vertexCapacityInput</code> parameter <strong class="purple">must</strong> be greater than <code>0</code></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingMeshFB-indexCapacityInput-arraylength" href="#VUID-XrHandTrackingMeshFB-indexCapacityInput-arraylength"></a> The <code>indexCapacityInput</code> parameter <strong class="purple">must</strong> be greater than <code>0</code></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p><a href="#XrHandTrackingScaleFB">XrHandTrackingScaleFB</a> <strong class="purple">can</strong> be provided in the <code>next</code> chain of
+<a href="#XrHandJointsLocateInfoEXT">XrHandJointsLocateInfoEXT</a> when calling <a href="#xrLocateHandJointsEXT">xrLocateHandJointsEXT</a> to
+indicate to the runtime that the requested joints need to be scaled to a
+different size and to query the existing scale value.
+This is useful in breaking up the overall scale out of the skinning
+transforms.</p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XrHandTrackingScaleFB">XrHandTrackingScaleFB</a> structure is defined as:</p>
+</div>
+<div id="XrHandTrackingScaleFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrHandTrackingScaleFB {
+    XrStructureType    type;
+    void*              next;
+    float              sensorOutput;
+    float              currentOutput;
+    XrBool32           overrideHandScale;
+    float              overrideValueInput;
+} XrHandTrackingScaleFB;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
+</li>
+<li>
+<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure
+chain.
+No such structures are defined in core OpenXR or this extension.</p>
+</li>
+<li>
+<p><code>sensorOutput</code> is an output value: the currently measured scale as
+would be applied without passing this structure.</p>
+</li>
+<li>
+<p><code>currentOutput</code> is an output value: the effective output that the bind
+skeleton is getting on the current call, which may be subject to
+filtering, scaling, or validation.</p>
+</li>
+<li>
+<p><code>overrideHandScale</code> indicates whether the runtime should scale the
+output of this <a href="#xrLocateHandJointsEXT">xrLocateHandJointsEXT</a> call according to
+<code>overrideValueInput</code></p>
+</li>
+<li>
+<p><code>overrideValueInput</code> is an optional input value, enabled only when the
+<code>overrideHandScale</code> parameter is set.
+Setting this to 1.0 and setting <code>overrideHandScale</code> to <code>true</code> will
+give the joints in mesh binding scale.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrHandTrackingScaleFB-extension-notenabled" href="#VUID-XrHandTrackingScaleFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_mesh">XR_FB_hand_tracking_mesh</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrHandTrackingScaleFB">XrHandTrackingScaleFB</a></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingScaleFB-type-type" href="#VUID-XrHandTrackingScaleFB-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_HAND_TRACKING_SCALE_FB</code></p>
+</li>
+<li>
+<p><a id="VUID-XrHandTrackingScaleFB-next-next" href="#VUID-XrHandTrackingScaleFB-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>New Functions</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p>The <a href="#xrGetHandMeshFB">xrGetHandMeshFB</a> function is defined as:</p>
+</div>
+<div id="xrGetHandMeshFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">XrResult xrGetHandMeshFB(
+    XrHandTrackerEXT                            handTracker,
+    XrHandTrackingMeshFB*                       mesh);</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Parameter Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>handTracker</code> is the <a href="#XrHandTrackerEXT">XrHandTrackerEXT</a> that is associated with a
+particular hand.</p>
+</li>
+<li>
+<p><code>mesh</code> is the <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a> output structure.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p>The <a href="#xrGetHandMeshFB">xrGetHandMeshFB</a> function populates an <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a>
+structure with enough information to render a skinned mesh driven by the
+hand joints.
+As discussed in the specification for that structure, the data enumerated by
+this call is constant during the lifetime of an <a href="#XrInstance">XrInstance</a>.</p>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-xrGetHandMeshFB-extension-notenabled" href="#VUID-xrGetHandMeshFB-extension-notenabled"></a> The <code><a href="#XR_FB_hand_tracking_mesh">XR_FB_hand_tracking_mesh</a></code> extension <strong class="purple">must</strong> be enabled prior to calling <a href="#xrGetHandMeshFB">xrGetHandMeshFB</a></p>
+</li>
+<li>
+<p><a id="VUID-xrGetHandMeshFB-handTracker-parameter" href="#VUID-xrGetHandMeshFB-handTracker-parameter"></a> <code>handTracker</code> <strong class="purple">must</strong> be a valid <a href="#XrHandTrackerEXT">XrHandTrackerEXT</a> handle</p>
+</li>
+<li>
+<p><a id="VUID-xrGetHandMeshFB-mesh-parameter" href="#VUID-xrGetHandMeshFB-mesh-parameter"></a> <code>mesh</code> <strong class="purple">must</strong> be a pointer to an <a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a> structure</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Return Codes</div>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><a href="#fundamentals-successcodes">Success</a></dt>
+<dd>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_SUCCESS</code></p>
+</li>
+<li>
+<p><code>XR_SESSION_LOSS_PENDING</code></p>
+</li>
+</ul>
+</div>
+</dd>
+<dt class="hdlist1"><a href="#fundamentals-errorcodes">Failure</a></dt>
+<dd>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_ERROR_FUNCTION_UNSUPPORTED</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_VALIDATION_FAILURE</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_RUNTIME_FAILURE</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_HANDLE_INVALID</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_INSTANCE_LOST</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_SESSION_LOST</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_SIZE_INSUFFICIENT</code></p>
+</li>
+<li>
+<p><code>XR_ERROR_FEATURE_UNSUPPORTED</code></p>
+</li>
+</ul>
+</div>
+</dd>
+</dl>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>Issues</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>Version History</strong></p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Revision 1, 2021-07-07 (Federico Schliemann)</p>
+<div class="ulist">
+<ul>
+<li>
+<p>Initial extension description</p>
+</li>
+</ul>
+</div>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="XR_FB_space_warp"><a class="anchor" href="#XR_FB_space_warp"></a>12.48. XR_FB_space_warp</h3>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><strong>Name String</strong></dt>
+<dd>
+<p><code>XR_FB_space_warp</code></p>
+</dd>
+<dt class="hdlist1"><strong>Extension Type</strong></dt>
+<dd>
+<p>Instance extension</p>
+</dd>
+<dt class="hdlist1"><strong>Registered Extension Number</strong></dt>
+<dd>
+<p>172</p>
+</dd>
+<dt class="hdlist1"><strong>Revision</strong></dt>
+<dd>
+<p>1</p>
+</dd>
+<dt class="hdlist1"><strong>Extension and Version Dependencies</strong></dt>
+<dd>
+<div class="ulist">
+<ul>
+<li>
+<p>Requires OpenXR 1.0</p>
+</li>
+</ul>
+</div>
+</dd>
+<dt class="hdlist1"><strong>Contributors</strong></dt>
+<dd>
+<p>Jian Zhang, Facebook<br>
+Neel Bedekar, Facebook<br>
+Xiang Wei, Facebook</p>
+</dd>
+</dl>
+</div>
+<div class="paragraph">
+<p><strong>Overview</strong></p>
+</div>
+<div class="paragraph">
+<p>This extension provides support to enable space warp technology on
+application.
+By feeding application generated motion vector and depth buffer images, the
+runtime can do high quality frame extrapolation and reprojection, allow
+applications to run at half fps but still providing smooth experience to
+users.</p>
+</div>
+<div class="paragraph">
+<p>In order to enable the functionality of this extension, the application
+<strong class="purple">must</strong> pass the name of the extension into <a href="#xrCreateInstance">xrCreateInstance</a> via the
+<a href="#XrInstanceCreateInfo">XrInstanceCreateInfo</a>::<code>enabledExtensionNames</code> parameter as
+indicated in the <a href="#extensions">Extensions</a> section.</p>
+</div>
+<div class="admonitionblock note">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-note" title="Note"></i>
+</td>
+<td class="content">
+<div class="title">Note</div>
+<div class="paragraph">
+<p>This extension is independent of <a href="#XR_KHR_composition_layer_depth">XR_KHR_composition_layer_depth</a>, and
+both may be enabled and used at the same time, for different purposes.
+The <a href="#XrCompositionLayerSpaceWarpInfoFB">XrCompositionLayerSpaceWarpInfoFB</a>::<code>depthSubImage</code> depth data
+is dedicated for space warp, and its resolution is usually lower than
+<a href="#XrCompositionLayerDepthInfoKHR">XrCompositionLayerDepthInfoKHR</a>::<code>subImage</code>.
+See <a href="#XrSystemSpaceWarpPropertiesFB">XrSystemSpaceWarpPropertiesFB</a> for suggested resolution of
+<code>depthSubImage</code>.</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p><strong>New Flag Types</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div id="XrCompositionLayerSpaceWarpInfoFlagsFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef XrFlags64 XrCompositionLayerSpaceWarpInfoFlagsFB;</code></pre>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock">
+<div class="content">
+<div id="XrCompositionLayerSpaceWarpInfoFlagBitsFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">// Flag bits for XrCompositionLayerSpaceWarpInfoFlagsFB</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>There are currently no space warp info flags.
+This is reserved for future use.</p>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>New Enum Constants</strong></p>
+</div>
+<div class="paragraph">
+<p><a href="#XrStructureType">XrStructureType</a> enumeration is extended with:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>XR_TYPE_COMPOSITION_LAYER_SPACE_WARP_INFO_FB</code></p>
+</li>
+<li>
+<p><code>XR_TYPE_SYSTEM_SPACE_WARP_PROPERTIES_FB</code></p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><strong>New Structures</strong></p>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p>When submitting motion vector buffer and depth buffers along with projection
+layers, add an <a href="#XrCompositionLayerSpaceWarpInfoFB">XrCompositionLayerSpaceWarpInfoFB</a> structure to the
+<a href="#XrCompositionLayerProjectionView">XrCompositionLayerProjectionView</a>::<code>next</code> chain, for each
+<a href="#XrCompositionLayerProjectionView">XrCompositionLayerProjectionView</a> structure in the given layer.</p>
+</div>
+<div class="paragraph">
+<p>The <a href="#XrCompositionLayerSpaceWarpInfoFB">XrCompositionLayerSpaceWarpInfoFB</a> structure is defined as:</p>
+</div>
+<div id="XrCompositionLayerSpaceWarpInfoFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrCompositionLayerSpaceWarpInfoFB {
+    XrStructureType                           type;
+    const void*                               next;
+    XrCompositionLayerSpaceWarpInfoFlagsFB    layerFlags;
+    XrSwapchainSubImage                       motionVectorSubImage;
+    XrPosef                                   appSpaceDeltaPose;
+    XrSwapchainSubImage                       depthSubImage;
+    float                                     minDepth;
+    float                                     maxDepth;
+    float                                     nearZ;
+    float                                     farZ;
+} XrCompositionLayerSpaceWarpInfoFB;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
+</li>
+<li>
+<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure
+chain.</p>
+</li>
+<li>
+<p><code>layerFlags</code> is a bitmask of
+<a href="#XrCompositionLayerSpaceWarpInfoFlagsFB">XrCompositionLayerSpaceWarpInfoFlagsFB</a>.</p>
+</li>
+<li>
+<p><code>motionVectorSubImage</code> identifies the motion vector image
+<a href="#XrSwapchainSubImage">XrSwapchainSubImage</a> to be associated with the submitted layer
+<a href="#XrCompositionLayerProjection">XrCompositionLayerProjection</a>.</p>
+</li>
+<li>
+<p><code>appSpaceDeltaPose</code> is the incremental application-applied transform,
+if any, since the previous frame that affects the view.
+When artificial locomotion (scripted movement, teleportation, etc.)
+happens, the application might transform the whole
+<a href="#XrCompositionLayerProjection">XrCompositionLayerProjection</a>::space from one application space pose
+to another pose between frames.
+The pose should be identity when there is no
+<a href="#XrCompositionLayerProjection">XrCompositionLayerProjection</a>::space transformation in application.</p>
+</li>
+<li>
+<p><code>depthSubImage</code> identifies the depth image <a href="#XrSwapchainSubImage">XrSwapchainSubImage</a>
+to be associated with motionVectorSubImage.
+The swapchain should be created with <code>XR_SWAPCHAIN_USAGE_SAMPLED_BIT</code>
+| <code>XR_SWAPCHAIN_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT</code>.</p>
+</li>
+<li>
+<p><code>minDepth</code> and <code>maxDepth</code> are the range of depth values the
+<code>depthSwapchain</code> could have, in the range of <span class="eq">[0.0,1.0]</span>.
+This is akin to min and max values of OpenGL&#8217;s <code>glDepthRange</code>, but
+with the requirement here that <span class="eq">maxDepth ≥ minDepth</span>.</p>
+</li>
+<li>
+<p><code>nearZ</code> is the positive distance in meters of the <code>minDepth</code> value
+in the depth swapchain.
+Applications <strong class="purple">may</strong> use a <code>nearZ</code> that is greater than <code>farZ</code> to
+indicate depth values are reversed.
+<code>nearZ</code> can be infinite.</p>
+</li>
+<li>
+<p><code>farZ</code> is the positive distance in meters of the <code>maxDepth</code> value
+in the depth swapchain.
+<code>farZ</code> can be infinite.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p>The motion vector data is stored in the <code>motionVectorSubImage</code>&#8217;s RGB
+channels, defined in NDC (normalized device coordinates) space, for example,
+the same surface point&#8217;s NDC is PrevNDC in previous frame, CurrNDC in
+current frame, then the motion vector value is "highp vec3 motionVector = (
+CurrNDC - PrevNDC ).xyz;".
+Signed 16 bit float pixel format is recommended for this image.</p>
+</div>
+<div class="paragraph">
+<p>The runtime <strong class="purple">must</strong> return error <code>XR_ERROR_VALIDATION_FAILURE</code> if
+<code>nearZ</code> == <code>farZ</code>.</p>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrCompositionLayerSpaceWarpInfoFB-extension-notenabled" href="#VUID-XrCompositionLayerSpaceWarpInfoFB-extension-notenabled"></a> The <code><a href="#XR_FB_space_warp">XR_FB_space_warp</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrCompositionLayerSpaceWarpInfoFB">XrCompositionLayerSpaceWarpInfoFB</a></p>
+</li>
+<li>
+<p><a id="VUID-XrCompositionLayerSpaceWarpInfoFB-type-type" href="#VUID-XrCompositionLayerSpaceWarpInfoFB-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_COMPOSITION_LAYER_SPACE_WARP_INFO_FB</code></p>
+</li>
+<li>
+<p><a id="VUID-XrCompositionLayerSpaceWarpInfoFB-next-next" href="#VUID-XrCompositionLayerSpaceWarpInfoFB-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
+</li>
+<li>
+<p><a id="VUID-XrCompositionLayerSpaceWarpInfoFB-layerFlags-zerobitmask" href="#VUID-XrCompositionLayerSpaceWarpInfoFB-layerFlags-zerobitmask"></a> <code>layerFlags</code> <strong class="purple">must</strong> be <code>0</code></p>
+</li>
+<li>
+<p><a id="VUID-XrCompositionLayerSpaceWarpInfoFB-motionVectorSubImage-parameter" href="#VUID-XrCompositionLayerSpaceWarpInfoFB-motionVectorSubImage-parameter"></a> <code>motionVectorSubImage</code> <strong class="purple">must</strong> be a valid <a href="#XrSwapchainSubImage">XrSwapchainSubImage</a> structure</p>
+</li>
+<li>
+<p><a id="VUID-XrCompositionLayerSpaceWarpInfoFB-depthSubImage-parameter" href="#VUID-XrCompositionLayerSpaceWarpInfoFB-depthSubImage-parameter"></a> <code>depthSubImage</code> <strong class="purple">must</strong> be a valid <a href="#XrSwapchainSubImage">XrSwapchainSubImage</a> structure</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock">
+<div class="content">
+<div class="paragraph">
+<p>When this extension is enabled, an application <strong class="purple">can</strong> pass in an
+<a href="#XrSystemSpaceWarpPropertiesFB">XrSystemSpaceWarpPropertiesFB</a> structure in the
+<a href="#XrSystemProperties">XrSystemProperties</a>::<code>next</code> chain when calling
+<a href="#xrGetSystemProperties">xrGetSystemProperties</a> to acquire information about recommended motion
+vector buffer resolution.
+The <a href="#XrSystemSpaceWarpPropertiesFB">XrSystemSpaceWarpPropertiesFB</a> structure is defined as:</p>
+</div>
+<div id="XrSystemSpaceWarpPropertiesFB" class="paragraph">
+<p></p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrSystemSpaceWarpPropertiesFB {
+    XrStructureType    type;
+    void*              next;
+    uint32_t           recommendedMotionVectorImageRectWidth;
+    uint32_t           recommendedMotionVectorImageRectHeight;
+} XrSystemSpaceWarpPropertiesFB;</code></pre>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Member Descriptions</div>
+<div class="ulist">
+<ul>
+<li>
+<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
+</li>
+<li>
+<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure
+chain.</p>
+</li>
+<li>
+<p><code>recommendedMotionVectorImageRectWidth</code>: recommended motion vector and
+depth image width</p>
+</li>
+<li>
+<p><code>recommendedMotionVectorImageRectHeight</code>: recommended motion vector
+and depth image height</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sidebarblock">
+<div class="content">
+<div class="title">Valid Usage (Implicit)</div>
+<div class="ulist">
+<ul>
+<li>
+<p><a id="VUID-XrSystemSpaceWarpPropertiesFB-extension-notenabled" href="#VUID-XrSystemSpaceWarpPropertiesFB-extension-notenabled"></a> The <code><a href="#XR_FB_space_warp">XR_FB_space_warp</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrSystemSpaceWarpPropertiesFB">XrSystemSpaceWarpPropertiesFB</a></p>
+</li>
+<li>
+<p><a id="VUID-XrSystemSpaceWarpPropertiesFB-type-type" href="#VUID-XrSystemSpaceWarpPropertiesFB-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_SYSTEM_SPACE_WARP_PROPERTIES_FB</code></p>
+</li>
+<li>
+<p><a id="VUID-XrSystemSpaceWarpPropertiesFB-next-next" href="#VUID-XrSystemSpaceWarpPropertiesFB-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>Issues</strong></p>
+</div>
+<div class="paragraph">
+<p><strong>Version History</strong></p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Revision 1, 2021-08-04 (Jian Zhang)</p>
+<div class="ulist">
+<ul>
+<li>
+<p>Initial extension description</p>
+</li>
+</ul>
+</div>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="XR_FB_swapchain_update_state"><a class="anchor" href="#XR_FB_swapchain_update_state"></a>12.49. XR_FB_swapchain_update_state</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -39588,7 +41008,7 @@ structures.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_FB_swapchain_update_state_android_surface"><a class="anchor" href="#XR_FB_swapchain_update_state_android_surface"></a>12.46. XR_FB_swapchain_update_state_android_surface</h3>
+<h3 id="XR_FB_swapchain_update_state_android_surface"><a class="anchor" href="#XR_FB_swapchain_update_state_android_surface"></a>12.50. XR_FB_swapchain_update_state_android_surface</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -39793,7 +41213,7 @@ the current swapchain width and height.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_FB_swapchain_update_state_opengl_es"><a class="anchor" href="#XR_FB_swapchain_update_state_opengl_es"></a>12.47. XR_FB_swapchain_update_state_opengl_es</h3>
+<h3 id="XR_FB_swapchain_update_state_opengl_es"><a class="anchor" href="#XR_FB_swapchain_update_state_opengl_es"></a>12.51. XR_FB_swapchain_update_state_opengl_es</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -40062,7 +41482,7 @@ current swapchain sampler state.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_FB_swapchain_update_state_vulkan"><a class="anchor" href="#XR_FB_swapchain_update_state_vulkan"></a>12.48. XR_FB_swapchain_update_state_vulkan</h3>
+<h3 id="XR_FB_swapchain_update_state_vulkan"><a class="anchor" href="#XR_FB_swapchain_update_state_vulkan"></a>12.52. XR_FB_swapchain_update_state_vulkan</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -40323,7 +41743,7 @@ current swapchain sampler state.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_HTC_vive_cosmos_controller_interaction"><a class="anchor" href="#XR_HTC_vive_cosmos_controller_interaction"></a>12.49. XR_HTC_vive_cosmos_controller_interaction</h3>
+<h3 id="XR_HTC_vive_cosmos_controller_interaction"><a class="anchor" href="#XR_HTC_vive_cosmos_controller_interaction"></a>12.53. XR_HTC_vive_cosmos_controller_interaction</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -40517,7 +41937,7 @@ use)</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_HUAWEI_controller_interaction"><a class="anchor" href="#XR_HUAWEI_controller_interaction"></a>12.50. XR_HUAWEI_controller_interaction</h3>
+<h3 id="XR_HUAWEI_controller_interaction"><a class="anchor" href="#XR_HUAWEI_controller_interaction"></a>12.54. XR_HUAWEI_controller_interaction</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -40687,7 +42107,7 @@ Huawei Controller.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MND_headless"><a class="anchor" href="#XR_MND_headless"></a>12.51. XR_MND_headless</h3>
+<h3 id="XR_MND_headless"><a class="anchor" href="#XR_MND_headless"></a>12.55. XR_MND_headless</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -40846,7 +42266,7 @@ false.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_composition_layer_reprojection"><a class="anchor" href="#XR_MSFT_composition_layer_reprojection"></a>12.52. XR_MSFT_composition_layer_reprojection</h3>
+<h3 id="XR_MSFT_composition_layer_reprojection"><a class="anchor" href="#XR_MSFT_composition_layer_reprojection"></a>12.56. XR_MSFT_composition_layer_reprojection</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -41378,7 +42798,7 @@ mode, the reprojection plane override <strong class="purple">may</strong> be ign
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_controller_model"><a class="anchor" href="#XR_MSFT_controller_model"></a>12.53. XR_MSFT_controller_model</h3>
+<h3 id="XR_MSFT_controller_model"><a class="anchor" href="#XR_MSFT_controller_model"></a>12.57. XR_MSFT_controller_model</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -42481,7 +43901,7 @@ in it&#8217;s parent node space.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_first_person_observer"><a class="anchor" href="#XR_MSFT_first_person_observer"></a>12.54. XR_MSFT_first_person_observer</h3>
+<h3 id="XR_MSFT_first_person_observer"><a class="anchor" href="#XR_MSFT_first_person_observer"></a>12.58. XR_MSFT_first_person_observer</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -42534,7 +43954,7 @@ Alex Turner, Microsoft<br></p>
 </dl>
 </div>
 <div class="sect3">
-<h4 id="_overview_4"><a class="anchor" href="#_overview_4"></a>12.54.1. Overview</h4>
+<h4 id="_overview_4"><a class="anchor" href="#_overview_4"></a>12.58.1. Overview</h4>
 <div class="paragraph">
 <p>This first-person observer view configuration enables the runtime to request
 the application to render an additional first-person view of the scene to be
@@ -42638,7 +44058,7 @@ blend modes when sharing render passes across both view configurations.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_hand_interaction"><a class="anchor" href="#XR_MSFT_hand_interaction"></a>12.55. XR_MSFT_hand_interaction</h3>
+<h3 id="XR_MSFT_hand_interaction"><a class="anchor" href="#XR_MSFT_hand_interaction"></a>12.59. XR_MSFT_hand_interaction</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -42794,7 +44214,7 @@ a controller.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_hand_tracking_mesh"><a class="anchor" href="#XR_MSFT_hand_tracking_mesh"></a>12.56. XR_MSFT_hand_tracking_mesh</h3>
+<h3 id="XR_MSFT_hand_tracking_mesh"><a class="anchor" href="#XR_MSFT_hand_tracking_mesh"></a>12.60. XR_MSFT_hand_tracking_mesh</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -44266,7 +45686,7 @@ while(1){
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_holographic_window_attachment"><a class="anchor" href="#XR_MSFT_holographic_window_attachment"></a>12.57. XR_MSFT_holographic_window_attachment</h3>
+<h3 id="XR_MSFT_holographic_window_attachment"><a class="anchor" href="#XR_MSFT_holographic_window_attachment"></a>12.61. XR_MSFT_holographic_window_attachment</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -44406,7 +45826,7 @@ thread is blocked, otherwise the call <strong class="purple">may</strong> deadlo
 </div>
 </div>
 <div class="sect3">
-<h4 id="_sample_code_2"><a class="anchor" href="#_sample_code_2"></a>12.57.1. Sample code</h4>
+<h4 id="_sample_code_2"><a class="anchor" href="#_sample_code_2"></a>12.61.1. Sample code</h4>
 <div class="paragraph">
 <p>Following example demos the usage of holographic window attachment and use
 the attached CoreWindow to receive keyboard input, use
@@ -44522,7 +45942,7 @@ int __stdcall wWinMain(HINSTANCE, HINSTANCE, PWSTR, int) {
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_perception_anchor_interop"><a class="anchor" href="#XR_MSFT_perception_anchor_interop"></a>12.58. XR_MSFT_perception_anchor_interop</h3>
+<h3 id="XR_MSFT_perception_anchor_interop"><a class="anchor" href="#XR_MSFT_perception_anchor_interop"></a>12.62. XR_MSFT_perception_anchor_interop</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -44887,7 +46307,7 @@ object, the function <strong class="purple">must</strong> return <code>XR_SUCCES
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_scene_understanding"><a class="anchor" href="#XR_MSFT_scene_understanding"></a>12.59. XR_MSFT_scene_understanding</h3>
+<h3 id="XR_MSFT_scene_understanding"><a class="anchor" href="#XR_MSFT_scene_understanding"></a>12.63. XR_MSFT_scene_understanding</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -49280,7 +50700,7 @@ the scene component within the reference frame of the corresponding
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_scene_understanding_serialization"><a class="anchor" href="#XR_MSFT_scene_understanding_serialization"></a>12.60. XR_MSFT_scene_understanding_serialization</h3>
+<h3 id="XR_MSFT_scene_understanding_serialization"><a class="anchor" href="#XR_MSFT_scene_understanding_serialization"></a>12.64. XR_MSFT_scene_understanding_serialization</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -49920,7 +51340,7 @@ deserialized.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_secondary_view_configuration"><a class="anchor" href="#XR_MSFT_secondary_view_configuration"></a>12.61. XR_MSFT_secondary_view_configuration</h3>
+<h3 id="XR_MSFT_secondary_view_configuration"><a class="anchor" href="#XR_MSFT_secondary_view_configuration"></a>12.65. XR_MSFT_secondary_view_configuration</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -49970,7 +51390,7 @@ Alex Turner, Microsoft<br></p>
 </dl>
 </div>
 <div class="sect3">
-<h4 id="_overview_5"><a class="anchor" href="#_overview_5"></a>12.61.1. Overview</h4>
+<h4 id="_overview_5"><a class="anchor" href="#_overview_5"></a>12.65.1. Overview</h4>
 <div class="paragraph">
 <p>This extension allows an application to enable support for one or more
 <strong>secondary view configurations</strong>.
@@ -50038,7 +51458,7 @@ structure.</p>
 </div>
 </div>
 <div class="sect3">
-<h4 id="_enumerate_supported_secondary_view_configurations"><a class="anchor" href="#_enumerate_supported_secondary_view_configurations"></a>12.61.2. Enumerate supported secondary view configurations</h4>
+<h4 id="_enumerate_supported_secondary_view_configurations"><a class="anchor" href="#_enumerate_supported_secondary_view_configurations"></a>12.65.2. Enumerate supported secondary view configurations</h4>
 <div class="paragraph">
 <p>The first step is for the application to inspect if a runtime supports
 certain secondary view configurations.
@@ -50052,7 +51472,7 @@ and can use this secondary view configuration type in later functions.</p>
 </div>
 </div>
 <div class="sect3">
-<h4 id="_secondary_view_configuration_properties"><a class="anchor" href="#_secondary_view_configuration_properties"></a>12.61.3. Secondary view configuration properties</h4>
+<h4 id="_secondary_view_configuration_properties"><a class="anchor" href="#_secondary_view_configuration_properties"></a>12.65.3. Secondary view configuration properties</h4>
 <div class="paragraph">
 <p>The application can inspect the properties of a secondary view configuration
 through the existing <a href="#xrGetViewConfigurationProperties">xrGetViewConfigurationProperties</a>,
@@ -50148,7 +51568,7 @@ configuration type was hinted when swapchain image was created.</p>
 </div>
 </div>
 <div class="sect3">
-<h4 id="_enable_secondary_view_configuration"><a class="anchor" href="#_enable_secondary_view_configuration"></a>12.61.4. Enable secondary view configuration</h4>
+<h4 id="_enable_secondary_view_configuration"><a class="anchor" href="#_enable_secondary_view_configuration"></a>12.65.4. Enable secondary view configuration</h4>
 <div class="paragraph">
 <p>The application indicates to the runtime which secondary view configurations
 it can support by chaining an
@@ -50248,7 +51668,7 @@ configuration types that application supports.</p>
 </div>
 </div>
 <div class="sect3">
-<h4 id="_per_frame_active_view_configurations"><a class="anchor" href="#_per_frame_active_view_configurations"></a>12.61.5. Per-frame active view configurations</h4>
+<h4 id="_per_frame_active_view_configurations"><a class="anchor" href="#_per_frame_active_view_configurations"></a>12.65.5. Per-frame active view configurations</h4>
 <div class="paragraph">
 <p>The runtime then tells the application at each <a href="#xrWaitFrame">xrWaitFrame</a> function
 call which of the enabled secondary view configurations are active for that
@@ -50441,7 +51861,7 @@ configuration inactive by setting the corresponding <code>active</code> in the
 </div>
 </div>
 <div class="sect3">
-<h4 id="_locate_and_inspect_view_states_of_secondary_view_configurations"><a class="anchor" href="#_locate_and_inspect_view_states_of_secondary_view_configurations"></a>12.61.6. Locate and inspect view states of secondary view configurations</h4>
+<h4 id="_locate_and_inspect_view_states_of_secondary_view_configurations"><a class="anchor" href="#_locate_and_inspect_view_states_of_secondary_view_configurations"></a>12.65.6. Locate and inspect view states of secondary view configurations</h4>
 <div class="paragraph">
 <p>When the application calls <a href="#xrLocateViews">xrLocateViews</a>, it <strong class="purple">can</strong> use
 <a href="#XrViewLocateInfo">XrViewLocateInfo</a>::viewConfigurationType field to query the view
@@ -50464,7 +51884,7 @@ successfully return, but the resulting <code>XrViewState</code> <strong class="p
 </div>
 </div>
 <div class="sect3">
-<h4 id="_submit_composition_layers_to_secondary_view_configurations"><a class="anchor" href="#_submit_composition_layers_to_secondary_view_configurations"></a>12.61.7. Submit composition layers to secondary view configurations</h4>
+<h4 id="_submit_composition_layers_to_secondary_view_configurations"><a class="anchor" href="#_submit_composition_layers_to_secondary_view_configurations"></a>12.65.7. Submit composition layers to secondary view configurations</h4>
 <div class="openblock">
 <div class="content">
 <div class="paragraph">
@@ -50776,7 +52196,7 @@ configuration.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_spatial_anchor"><a class="anchor" href="#XR_MSFT_spatial_anchor"></a>12.62. XR_MSFT_spatial_anchor</h3>
+<h3 id="XR_MSFT_spatial_anchor"><a class="anchor" href="#XR_MSFT_spatial_anchor"></a>12.66. XR_MSFT_spatial_anchor</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -51439,777 +52859,7 @@ externally synchronized</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_spatial_anchor_export_preview"><a class="anchor" href="#XR_MSFT_spatial_anchor_export_preview"></a>12.63. XR_MSFT_spatial_anchor_export_preview</h3>
-<div class="dlist">
-<dl>
-<dt class="hdlist1"><strong>Name String</strong></dt>
-<dd>
-<p><code>XR_MSFT_spatial_anchor_export_preview</code></p>
-</dd>
-<dt class="hdlist1"><strong>Extension Type</strong></dt>
-<dd>
-<p>Instance extension</p>
-</dd>
-<dt class="hdlist1"><strong>Registered Extension Number</strong></dt>
-<dd>
-<p>63</p>
-</dd>
-<dt class="hdlist1"><strong>Revision</strong></dt>
-<dd>
-<p>1</p>
-</dd>
-<dt class="hdlist1"><strong>Extension and Version Dependencies</strong></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p>Requires OpenXR 1.0</p>
-</li>
-<li>
-<p>Requires <code><a href="#XR_MSFT_spatial_anchor">XR_MSFT_spatial_anchor</a></code></p>
-</li>
-</ul>
-</div>
-</dd>
-<dt class="hdlist1"><strong>Last Modified Date</strong></dt>
-<dd>
-<p>2020-05-05</p>
-</dd>
-<dt class="hdlist1"><strong>IP Status</strong></dt>
-<dd>
-<p>No known IP claims.</p>
-</dd>
-<dt class="hdlist1"><strong>Contributors</strong></dt>
-<dd>
-<p>Lachlan Ford, Microsoft<br>
-Alex Turner, Microsoft<br>
-David Fields, Microsoft<br>
-Vicente Rivera, Microsoft<br>
-Yin Li, Microsoft<br></p>
-</dd>
-</dl>
-</div>
-<div class="paragraph">
-<p><strong>Overview</strong></p>
-</div>
-<div class="paragraph">
-<p>This extension allows querying and exporting of spatial anchor data suitable for sharing and relocalization across devices,
-so that both devices can reason about the same locations in their users' surroundings.
-This extension requires <a href="#XR_MSFT_spatial_anchor">XR_MSFT_spatial_anchor</a> to also be active.</p>
-</div>
-<div class="paragraph">
-<p><strong>Output Stream</strong></p>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>Anchor data is accessed through an <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> handle. This handle represents a stream of data which <strong class="purple">can</strong> be written to a buffer to be used by the application.</p>
-</div>
-<div id="XrSpatialAnchorNeighborhoodDataStreamMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">            XR_DEFINE_HANDLE(XrSpatialAnchorNeighborhoodDataStreamMSFT)</code></pre>
-</div>
-</div>
-</div>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The application <strong class="purple">can</strong> use the <a href="#xrCreateSpatialAnchorNeighborhoodDataStreamMSFT">xrCreateSpatialAnchorNeighborhoodDataStreamMSFT</a> function
-to create the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> object for the corresponding anchor export data.
-If the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> cannot be created for the <a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a>,
-either due to it being insufficient for export, or another reason, the function <strong class="purple">must</strong> return <code>XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT</code>.</p>
-</div>
-<div class="paragraph">
-<p>Calls to this function <strong class="purple">may</strong> block and thus <strong class="purple">should</strong> be called asynchronously.</p>
-</div>
-<div id="xrCreateSpatialAnchorNeighborhoodDataStreamMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">XrResult xrCreateSpatialAnchorNeighborhoodDataStreamMSFT(
-    XrSpatialAnchorMSFT                         spatialAnchor,
-    const XrSpatialAnchorExportPurposeInfoMSFT* exportPurposeInfo,
-    XrSpatialAnchorNeighborhoodDataStreamMSFT*  neighborhoodDataStream);</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Parameter Descriptions</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>spatialAnchor</code> is <a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a> for which to create the output stream for.</p>
-</li>
-<li>
-<p><code>exportPurposeInfo</code> is the <a href="#XrSpatialAnchorExportPurposeMSFT">XrSpatialAnchorExportPurposeMSFT</a> that the anchor data will be exported for.</p>
-</li>
-<li>
-<p><code>neighborhoodDataStream</code> is a pointer to the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> handle.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Valid Usage (Implicit)</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a id="VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-extension-notenabled" href="#VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-extension-notenabled"></a> The <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension <strong class="purple">must</strong> be enabled prior to calling <a href="#xrCreateSpatialAnchorNeighborhoodDataStreamMSFT">xrCreateSpatialAnchorNeighborhoodDataStreamMSFT</a></p>
-</li>
-<li>
-<p><a id="VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-spatialAnchor-parameter" href="#VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-spatialAnchor-parameter"></a> <code>spatialAnchor</code> <strong class="purple">must</strong> be a valid <a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a> handle</p>
-</li>
-<li>
-<p><a id="VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-exportPurposeInfo-parameter" href="#VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-exportPurposeInfo-parameter"></a> <code>exportPurposeInfo</code> <strong class="purple">must</strong> be a pointer to a valid <a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a> structure</p>
-</li>
-<li>
-<p><a id="VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-neighborhoodDataStream-parameter" href="#VUID-xrCreateSpatialAnchorNeighborhoodDataStreamMSFT-neighborhoodDataStream-parameter"></a> <code>neighborhoodDataStream</code> <strong class="purple">must</strong> be a pointer to an <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> handle</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Return Codes</div>
-<div class="dlist">
-<dl>
-<dt class="hdlist1"><a href="#fundamentals-successcodes">Success</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_SUCCESS</code></p>
-</li>
-<li>
-<p><code>XR_SESSION_LOSS_PENDING</code></p>
-</li>
-</ul>
-</div>
-</dd>
-<dt class="hdlist1"><a href="#fundamentals-errorcodes">Failure</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_ERROR_INSTANCE_LOST</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_OUT_OF_MEMORY</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_FUNCTION_UNSUPPORTED</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_VALIDATION_FAILURE</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_HANDLE_INVALID</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_SESSION_LOST</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_LIMIT_REACHED</code></p>
-</li>
-</ul>
-</div>
-</dd>
-</dl>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The application <strong class="purple">can</strong> use the <a href="#xrReadSpatialAnchorNeighborhoodDataMSFT">xrReadSpatialAnchorNeighborhoodDataMSFT</a> function
-to read the current contents of the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> to an application defined buffer.</p>
-</div>
-<div class="paragraph">
-<p><code>XR_SUCCESS</code> will be returned from this function as long as there is more data to read (even if 0 bytes were read).
-<code>XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT</code> will be returned from this function if all data has been successfully read.
-If <code>XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT</code> has been returned, the runtime <strong class="purple">must</strong> continue to return <code>XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT</code> and not write any more data to the buffer.
-If the operation has failed, the runtime <strong class="purple">must</strong> continue to return <code>XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT</code> from all subsequent calls to this function with the same <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a>.</p>
-</div>
-<div class="paragraph">
-<p>This function will return <code>XR_SUCCESS</code> if there is more data to read as of the latest call to the function.
-This function will return <code>XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT</code> if all data has been read as of the latest call to the function.</p>
-</div>
-<div class="paragraph">
-<p>Calls to this function <strong class="purple">may</strong> block and thus <strong class="purple">should</strong> be called asynchronously.</p>
-</div>
-<div id="xrReadSpatialAnchorNeighborhoodDataMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">XrResult xrReadSpatialAnchorNeighborhoodDataMSFT(
-    XrSpatialAnchorNeighborhoodDataStreamMSFT   neighborhoodDataStream,
-    uint32_t                                    bytesToRead,
-    uint32_t*                                   bytesRead,
-    void*                                       buffer);</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Parameter Descriptions</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>neighborhoodDataStream</code> is the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> to read from.</p>
-</li>
-<li>
-<p><code>bytesToRead</code> is size of the application defined buffer in bytes.</p>
-</li>
-<li>
-<p><code>bytesRead</code> is the amount of bytes written by this call to the application defined buffer.</p>
-</li>
-<li>
-<p><code>buffer</code> is a pointer to the application defined buffer.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Valid Usage (Implicit)</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a id="VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-extension-notenabled" href="#VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-extension-notenabled"></a> The <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension <strong class="purple">must</strong> be enabled prior to calling <a href="#xrReadSpatialAnchorNeighborhoodDataMSFT">xrReadSpatialAnchorNeighborhoodDataMSFT</a></p>
-</li>
-<li>
-<p><a id="VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-neighborhoodDataStream-parameter" href="#VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-neighborhoodDataStream-parameter"></a> <code>neighborhoodDataStream</code> <strong class="purple">must</strong> be a valid <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> handle</p>
-</li>
-<li>
-<p><a id="VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-bytesRead-parameter" href="#VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-bytesRead-parameter"></a> <code>bytesRead</code> <strong class="purple">must</strong> be a pointer to a <code>uint32_t</code> value</p>
-</li>
-<li>
-<p><a id="VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-buffer-parameter" href="#VUID-xrReadSpatialAnchorNeighborhoodDataMSFT-buffer-parameter"></a> If <code>bytesToRead</code> is not <code>0</code>, <code>buffer</code> <strong class="purple">must</strong> be a pointer to an array of <code>bytesToRead</code> bytes</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Return Codes</div>
-<div class="dlist">
-<dl>
-<dt class="hdlist1"><a href="#fundamentals-successcodes">Success</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_SUCCESS</code></p>
-</li>
-<li>
-<p><code>XR_SESSION_LOSS_PENDING</code></p>
-</li>
-<li>
-<p><code>XR_SPATIAL_ANCHOR_EXPORT_DATA_UNAVAILABLE_MSFT</code></p>
-</li>
-</ul>
-</div>
-</dd>
-<dt class="hdlist1"><a href="#fundamentals-errorcodes">Failure</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_ERROR_INSTANCE_LOST</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_OUT_OF_MEMORY</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_FUNCTION_UNSUPPORTED</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_VALIDATION_FAILURE</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_HANDLE_INVALID</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_SESSION_LOST</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_SPATIAL_ANCHOR_EXPORT_FAILED_MSFT</code></p>
-</li>
-</ul>
-</div>
-</dd>
-</dl>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The application <strong class="purple">can</strong> use the <a href="#xrDestroySpatialAnchorNeighborhoodDataStreamMSFT">xrDestroySpatialAnchorNeighborhoodDataStreamMSFT</a> function
-to destroy an <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> handle. The runtime <strong class="purple">may</strong> free the underlying resources represented by the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a>.</p>
-</div>
-<div id="xrDestroySpatialAnchorNeighborhoodDataStreamMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">XrResult xrDestroySpatialAnchorNeighborhoodDataStreamMSFT(
-    XrSpatialAnchorNeighborhoodDataStreamMSFT   neighborhoodDataStream);</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Parameter Descriptions</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>neighborhoodDataStream</code> is the <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> to destroy.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Valid Usage (Implicit)</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a id="VUID-xrDestroySpatialAnchorNeighborhoodDataStreamMSFT-extension-notenabled" href="#VUID-xrDestroySpatialAnchorNeighborhoodDataStreamMSFT-extension-notenabled"></a> The <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension <strong class="purple">must</strong> be enabled prior to calling <a href="#xrDestroySpatialAnchorNeighborhoodDataStreamMSFT">xrDestroySpatialAnchorNeighborhoodDataStreamMSFT</a></p>
-</li>
-<li>
-<p><a id="VUID-xrDestroySpatialAnchorNeighborhoodDataStreamMSFT-neighborhoodDataStream-parameter" href="#VUID-xrDestroySpatialAnchorNeighborhoodDataStreamMSFT-neighborhoodDataStream-parameter"></a> <code>neighborhoodDataStream</code> <strong class="purple">must</strong> be a valid <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> handle</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Thread Safety</div>
-<div class="ulist">
-<ul>
-<li>
-<p>Access to <code>neighborhoodDataStream</code>, and any child handles, <strong class="purple">must</strong> be externally synchronized</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Return Codes</div>
-<div class="dlist">
-<dl>
-<dt class="hdlist1"><a href="#fundamentals-successcodes">Success</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_SUCCESS</code></p>
-</li>
-</ul>
-</div>
-</dd>
-<dt class="hdlist1"><a href="#fundamentals-errorcodes">Failure</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_ERROR_OUT_OF_MEMORY</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_FUNCTION_UNSUPPORTED</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_HANDLE_INVALID</code></p>
-</li>
-</ul>
-</div>
-</dd>
-</dl>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="paragraph">
-<p><strong>Exporting Anchor Data</strong></p>
-</div>
-<div class="paragraph">
-<p>The <a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a> for the anchor export data may be generated from an <a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a>.</p>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The application <strong class="purple">can</strong> use the <a href="#xrGetSpatialAnchorExportSufficiencyMSFT">xrGetSpatialAnchorExportSufficiencyMSFT</a> function to inspect the export sufficiency of an anchor.
-If the system has gathered enough data to export the anchor, the runtime <strong class="purple">must</strong> set <code>isMinimallySufficient</code> on
-<a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a> will be set to <code>XR_TRUE</code>, otherwise it <strong class="purple">must</strong> be set to <code>XR_FALSE</code>.
-<code>XR_ERROR_SPATIAL_ANCHOR_SUFFICIENCY_QUERY_FAILED_MSFT</code> <strong class="purple">may</strong> be returned from this function if the operation has failed for any reason.</p>
-</div>
-<div class="paragraph">
-<p>Calls to this function <strong class="purple">may</strong> block and thus <strong class="purple">should</strong> be called asynchronously.</p>
-</div>
-<div id="xrGetSpatialAnchorExportSufficiencyMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">XrResult xrGetSpatialAnchorExportSufficiencyMSFT(
-    XrSpatialAnchorMSFT                         spatialAnchor,
-    const XrSpatialAnchorExportPurposeInfoMSFT* exportPurposeInfo,
-    XrSpatialAnchorExportSufficiencyMSFT*       exportSufficiency);</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Parameter Descriptions</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>spatialAnchor</code> is <a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a> for which to compute the export sufficiency.</p>
-</li>
-<li>
-<p><code>exportPurposeInfo</code> is the <a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a> that the anchor data will be exported for.</p>
-</li>
-<li>
-<p><code>exportSufficiency</code> is a pointer to the <a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a> where the export sufficiency result will be stored.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Valid Usage (Implicit)</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a id="VUID-xrGetSpatialAnchorExportSufficiencyMSFT-extension-notenabled" href="#VUID-xrGetSpatialAnchorExportSufficiencyMSFT-extension-notenabled"></a> The <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension <strong class="purple">must</strong> be enabled prior to calling <a href="#xrGetSpatialAnchorExportSufficiencyMSFT">xrGetSpatialAnchorExportSufficiencyMSFT</a></p>
-</li>
-<li>
-<p><a id="VUID-xrGetSpatialAnchorExportSufficiencyMSFT-spatialAnchor-parameter" href="#VUID-xrGetSpatialAnchorExportSufficiencyMSFT-spatialAnchor-parameter"></a> <code>spatialAnchor</code> <strong class="purple">must</strong> be a valid <a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a> handle</p>
-</li>
-<li>
-<p><a id="VUID-xrGetSpatialAnchorExportSufficiencyMSFT-exportPurposeInfo-parameter" href="#VUID-xrGetSpatialAnchorExportSufficiencyMSFT-exportPurposeInfo-parameter"></a> <code>exportPurposeInfo</code> <strong class="purple">must</strong> be a pointer to a valid <a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a> structure</p>
-</li>
-<li>
-<p><a id="VUID-xrGetSpatialAnchorExportSufficiencyMSFT-exportSufficiency-parameter" href="#VUID-xrGetSpatialAnchorExportSufficiencyMSFT-exportSufficiency-parameter"></a> <code>exportSufficiency</code> <strong class="purple">must</strong> be a pointer to an <a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a> structure</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Return Codes</div>
-<div class="dlist">
-<dl>
-<dt class="hdlist1"><a href="#fundamentals-successcodes">Success</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_SUCCESS</code></p>
-</li>
-<li>
-<p><code>XR_SESSION_LOSS_PENDING</code></p>
-</li>
-</ul>
-</div>
-</dd>
-<dt class="hdlist1"><a href="#fundamentals-errorcodes">Failure</a></dt>
-<dd>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_ERROR_INSTANCE_LOST</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_OUT_OF_MEMORY</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_FUNCTION_UNSUPPORTED</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_VALIDATION_FAILURE</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_HANDLE_INVALID</code></p>
-</li>
-<li>
-<p><code>XR_ERROR_SESSION_LOST</code></p>
-</li>
-</ul>
-</div>
-</dd>
-</dl>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The <a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a> structure is defined as:</p>
-</div>
-<div id="XrSpatialAnchorExportPurposeInfoMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrSpatialAnchorExportPurposeInfoMSFT {
-    XrStructureType                     type;
-    const void*                         next;
-    XrSpatialAnchorExportPurposeMSFT    exportPurpose;
-} XrSpatialAnchorExportPurposeInfoMSFT;</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Member Descriptions</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
-</li>
-<li>
-<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure chain.</p>
-</li>
-<li>
-<p><code>exportPurpose</code> is the <a href="#XrSpatialAnchorExportPurposeMSFT">XrSpatialAnchorExportPurposeMSFT</a> requested by the application.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Valid Usage (Implicit)</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportPurposeInfoMSFT-extension-notenabled" href="#VUID-XrSpatialAnchorExportPurposeInfoMSFT-extension-notenabled"></a> The <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a></p>
-</li>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportPurposeInfoMSFT-type-type" href="#VUID-XrSpatialAnchorExportPurposeInfoMSFT-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_SPATIAL_ANCHOR_EXPORT_PURPOSE_INFO_MSFT</code></p>
-</li>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportPurposeInfoMSFT-next-next" href="#VUID-XrSpatialAnchorExportPurposeInfoMSFT-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
-</li>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportPurposeInfoMSFT-exportPurpose-parameter" href="#VUID-XrSpatialAnchorExportPurposeInfoMSFT-exportPurpose-parameter"></a> <code>exportPurpose</code> <strong class="purple">must</strong> be a valid <a href="#XrSpatialAnchorExportPurposeMSFT">XrSpatialAnchorExportPurposeMSFT</a> value</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The flags of <a href="#XrSpatialAnchorExportPurposeMSFT">XrSpatialAnchorExportPurposeMSFT</a> are defined as:</p>
-</div>
-<div id="XrSpatialAnchorExportPurposeMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">typedef enum XrSpatialAnchorExportPurposeMSFT {
-    XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_RELOCALIZATION_MSFT = 0,
-    XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_SHARING_MSFT = 1,
-    XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_MAX_ENUM_MSFT = 0x7FFFFFFF
-} XrSpatialAnchorExportPurposeMSFT;</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_RELOCALIZATION_MSFT</code> indicates that the
-exported data is to be used for relocalization.</p>
-</li>
-<li>
-<p><code>XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_SHARING_MSFT</code> indicates that the
-export is to be used for sharing.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="openblock">
-<div class="content">
-<div class="paragraph">
-<p>The <a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a> structure is defined as:</p>
-</div>
-<div id="XrSpatialAnchorExportSufficiencyMSFT" class="paragraph">
-<p></p>
-</div>
-<div class="listingblock">
-<div class="content">
-<pre class="prettyprint highlight"><code data-lang="c++">typedef struct XrSpatialAnchorExportSufficiencyMSFT {
-    XrStructureType    type;
-    const void*        next;
-    XrBool32           isMinimallySufficient;
-    float              recommendedSufficiencyLevel;
-    float              sufficiencyLevel;
-} XrSpatialAnchorExportSufficiencyMSFT;</code></pre>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Member Descriptions</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>type</code> is the <a href="#XrStructureType">XrStructureType</a> of this structure.</p>
-</li>
-<li>
-<p><code>next</code> is <code>NULL</code> or a pointer to the next structure in a structure chain.</p>
-</li>
-<li>
-<p><code>isMinimallySufficient</code> is <code>XR_TRUE</code> if there is sufficient data to export for the anchor and <code>XR_FALSE</code> otherwise.</p>
-</li>
-<li>
-<p><code>recommendedSufficiencyLevel</code> is the sufficiency level that is ideal for the export of this anchor&#8217;s data.</p>
-</li>
-<li>
-<p><code>sufficiencyLevel</code> is the current sufficiency level of the anchor.</p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-<div class="sidebarblock">
-<div class="content">
-<div class="title">Valid Usage (Implicit)</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportSufficiencyMSFT-extension-notenabled" href="#VUID-XrSpatialAnchorExportSufficiencyMSFT-extension-notenabled"></a> The <code><a href="#XR_MSFT_spatial_anchor_export_preview">XR_MSFT_spatial_anchor_export_preview</a></code> extension <strong class="purple">must</strong> be enabled prior to using <a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a></p>
-</li>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportSufficiencyMSFT-type-type" href="#VUID-XrSpatialAnchorExportSufficiencyMSFT-type-type"></a> <code>type</code> <strong class="purple">must</strong> be <code>XR_TYPE_SPATIAL_ANCHOR_EXPORT_SUFFICIENCY_MSFT</code></p>
-</li>
-<li>
-<p><a id="VUID-XrSpatialAnchorExportSufficiencyMSFT-next-next" href="#VUID-XrSpatialAnchorExportSufficiencyMSFT-next-next"></a> <code>next</code> <strong class="purple">must</strong> be <code>NULL</code> or a valid pointer to the <a href="#valid-usage-for-structure-pointer-chains">next structure in a structure chain</a></p>
-</li>
-</ul>
-</div>
-</div>
-</div>
-</div>
-</div>
-<div class="paragraph">
-<p><strong>New Object Types</strong></p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a></p>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p><strong>New Flag Types</strong></p>
-</div>
-<div class="paragraph">
-<p><strong>New Enum Constants</strong></p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><code>XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_RELOCALIZATION_MSFT</code></p>
-</li>
-<li>
-<p><code>XR_SPATIAL_ANCHOR_EXPORT_PURPOSE_SHARING_MSFT</code></p>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p><strong>New Enums</strong></p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a href="#XrSpatialAnchorExportPurposeMSFT">XrSpatialAnchorExportPurposeMSFT</a></p>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p><strong>New Structures</strong></p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a></p>
-</li>
-<li>
-<p><a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a></p>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p><strong>New Functions</strong></p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a href="#xrDestroySpatialAnchorNeighborhoodDataStreamMSFT">xrDestroySpatialAnchorNeighborhoodDataStreamMSFT</a></p>
-</li>
-<li>
-<p><a href="#xrReadSpatialAnchorNeighborhoodDataMSFT">xrReadSpatialAnchorNeighborhoodDataMSFT</a></p>
-</li>
-<li>
-<p><a href="#xrGetSpatialAnchorExportSufficiencyMSFT">xrGetSpatialAnchorExportSufficiencyMSFT</a></p>
-</li>
-<li>
-<p><a href="#xrCreateSpatialAnchorNeighborhoodDataStreamMSFT">xrCreateSpatialAnchorNeighborhoodDataStreamMSFT</a></p>
-</li>
-</ul>
-</div>
-<div class="paragraph">
-<p><strong>Version History</strong></p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p>Revision 1, 2020-05-05 (Lachlan Ford)</p>
-<div class="ulist">
-<ul>
-<li>
-<p>Initial extension proposal</p>
-</li>
-</ul>
-</div>
-</li>
-</ul>
-</div>
-</div>
-<div class="sect2">
-<h3 id="XR_MSFT_spatial_anchor_persistence"><a class="anchor" href="#XR_MSFT_spatial_anchor_persistence"></a>12.64. XR_MSFT_spatial_anchor_persistence</h3>
+<h3 id="XR_MSFT_spatial_anchor_persistence"><a class="anchor" href="#XR_MSFT_spatial_anchor_persistence"></a>12.67. XR_MSFT_spatial_anchor_persistence</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -53394,7 +54044,7 @@ perform the clear operation on.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_spatial_graph_bridge"><a class="anchor" href="#XR_MSFT_spatial_graph_bridge"></a>12.65. XR_MSFT_spatial_graph_bridge</h3>
+<h3 id="XR_MSFT_spatial_graph_bridge"><a class="anchor" href="#XR_MSFT_spatial_graph_bridge"></a>12.68. XR_MSFT_spatial_graph_bridge</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -53735,7 +54385,7 @@ Dynamic spatial nodes are represented by
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_MSFT_unbounded_reference_space"><a class="anchor" href="#XR_MSFT_unbounded_reference_space"></a>12.66. XR_MSFT_unbounded_reference_space</h3>
+<h3 id="XR_MSFT_unbounded_reference_space"><a class="anchor" href="#XR_MSFT_unbounded_reference_space"></a>12.69. XR_MSFT_unbounded_reference_space</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -53899,7 +54549,7 @@ extension is enabled.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_OCULUS_android_session_state_enable"><a class="anchor" href="#XR_OCULUS_android_session_state_enable"></a>12.67. XR_OCULUS_android_session_state_enable</h3>
+<h3 id="XR_OCULUS_android_session_state_enable"><a class="anchor" href="#XR_OCULUS_android_session_state_enable"></a>12.70. XR_OCULUS_android_session_state_enable</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -54078,7 +54728,7 @@ from surfaceDestroyed() or onPause(), whichever comes first.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_OCULUS_audio_device_guid"><a class="anchor" href="#XR_OCULUS_audio_device_guid"></a>12.68. XR_OCULUS_audio_device_guid</h3>
+<h3 id="XR_OCULUS_audio_device_guid"><a class="anchor" href="#XR_OCULUS_audio_device_guid"></a>12.71. XR_OCULUS_audio_device_guid</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -54358,7 +55008,7 @@ API.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_VALVE_analog_threshold"><a class="anchor" href="#XR_VALVE_analog_threshold"></a>12.69. XR_VALVE_analog_threshold</h3>
+<h3 id="XR_VALVE_analog_threshold"><a class="anchor" href="#XR_VALVE_analog_threshold"></a>12.72. XR_VALVE_analog_threshold</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -54375,7 +55025,7 @@ API.</p>
 </dd>
 <dt class="hdlist1"><strong>Revision</strong></dt>
 <dd>
-<p>1</p>
+<p>2</p>
 </dd>
 <dt class="hdlist1"><strong>Extension and Version Dependencies</strong></dt>
 <dd>
@@ -54389,7 +55039,7 @@ API.</p>
 </dd>
 <dt class="hdlist1"><strong>Last Modified Date</strong></dt>
 <dd>
-<p>2020-06-29</p>
+<p>2021-06-09</p>
 </dd>
 <dt class="hdlist1"><strong>IP Status</strong></dt>
 <dd>
@@ -54397,7 +55047,9 @@ API.</p>
 </dd>
 <dt class="hdlist1"><strong>Contributors</strong></dt>
 <dd>
-<p>Joe Ludwig, Valve</p>
+<p>Joe Ludwig, Valve<br>
+Rune Berg, Valve<br>
+Andres Rodriguez, Valve<br></p>
 </dd>
 </dl>
 </div>
@@ -54410,6 +55062,10 @@ feedback applied to an analog to digital conversion.
 See <a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnalogThresholdVALVE</a> for more information.</p>
 </div>
 <div class="paragraph">
+<p>Applications <strong class="purple">should</strong> also enable the <code><a href="#XR_KHR_binding_modification">XR_KHR_binding_modification</a></code>
+extension to be able to define multiple thresholds.</p>
+</div>
+<div class="paragraph">
 <p><strong>New Object Types</strong></p>
 </div>
 <div class="paragraph">
@@ -54428,9 +55084,10 @@ See <a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnal
 <div class="content">
 <div class="paragraph">
 <p>The <a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnalogThresholdVALVE</a> structure is an input
-struct which can be added to the next chain of
-<a href="#XrInteractionProfileSuggestedBinding">XrInteractionProfileSuggestedBinding</a> to the thresholds and haptic
-feedback to use for a suggested binding.</p>
+struct that defines thresholds and haptic feedback behavior for action
+bindings and <strong class="purple">should</strong> be added to the <code>bindingModifications</code> array of the
+<a href="#XrBindingModificationsKHR">XrBindingModificationsKHR</a> structure (See
+<code><a href="#XR_KHR_binding_modification">XR_KHR_binding_modification</a></code> extension).</p>
 </div>
 <div id="XrInteractionProfileAnalogThresholdVALVE" class="paragraph">
 <p></p>
@@ -54500,11 +55157,15 @@ This field <strong class="purple">can</strong> point to any supported sub-type o
 </div>
 </div>
 <div class="paragraph">
-<p>Applications can chain an <a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnalogThresholdVALVE</a>
-struct on the next chain of any <a href="#xrSuggestInteractionProfileBindings">xrSuggestInteractionProfileBindings</a>
-call for each analog to boolean conversion for which it wants to set the
-threshold.
-If a threshold struct is present for a given conversion, the runtime <strong class="purple">must</strong>
+<p>Applications can also chain a single
+<a href="#XrInteractionProfileAnalogThresholdVALVE">XrInteractionProfileAnalogThresholdVALVE</a> structure on the next chain
+of any <a href="#xrSuggestInteractionProfileBindings">xrSuggestInteractionProfileBindings</a> call.
+Runtimes <strong class="purple">must</strong> support this kind of chaining.
+This method of specifying analog thresholds is deprecated however, and
+should not be used by any new applications.</p>
+</div>
+<div class="paragraph">
+<p>If a threshold struct is present for a given conversion, the runtime <strong class="purple">must</strong>
 use those thresholds instead of applying its own whenever it is using the
 binding suggested by the application.</p>
 </div>
@@ -54578,11 +55239,24 @@ binding list for this interaction profile, the runtime <strong class="purple">mu
 </ul>
 </div>
 </li>
+<li>
+<p>Revision 2, 2021-07-28 (Rune Berg)</p>
+<div class="ulist">
+<ul>
+<li>
+<p>Deprecate chaining of struct in
+<a href="#XrInteractionProfileSuggestedBinding">XrInteractionProfileSuggestedBinding</a>, applications should use
+<a href="#XrBindingModificationsKHR">XrBindingModificationsKHR</a> defined in the
+<code><a href="#XR_KHR_binding_modification">XR_KHR_binding_modification</a></code> extension instead.</p>
+</li>
+</ul>
+</div>
+</li>
 </ul>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_VARJO_composition_layer_depth_test"><a class="anchor" href="#XR_VARJO_composition_layer_depth_test"></a>12.70. XR_VARJO_composition_layer_depth_test</h3>
+<h3 id="XR_VARJO_composition_layer_depth_test"><a class="anchor" href="#XR_VARJO_composition_layer_depth_test"></a>12.73. XR_VARJO_composition_layer_depth_test</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -54835,7 +55509,7 @@ bound.</p>
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_VARJO_environment_depth_estimation"><a class="anchor" href="#XR_VARJO_environment_depth_estimation"></a>12.71. XR_VARJO_environment_depth_estimation</h3>
+<h3 id="XR_VARJO_environment_depth_estimation"><a class="anchor" href="#XR_VARJO_environment_depth_estimation"></a>12.74. XR_VARJO_environment_depth_estimation</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -55034,7 +55708,7 @@ enable the functionality when environment blend mode is set to
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_VARJO_foveated_rendering"><a class="anchor" href="#XR_VARJO_foveated_rendering"></a>12.72. XR_VARJO_foveated_rendering</h3>
+<h3 id="XR_VARJO_foveated_rendering"><a class="anchor" href="#XR_VARJO_foveated_rendering"></a>12.75. XR_VARJO_foveated_rendering</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -55083,7 +55757,7 @@ Antti Hirvonen, Varjo Technologies</p>
 </dl>
 </div>
 <div class="sect3">
-<h4 id="_overview_6"><a class="anchor" href="#_overview_6"></a>12.72.1. Overview</h4>
+<h4 id="_overview_6"><a class="anchor" href="#_overview_6"></a>12.75.1. Overview</h4>
 <div class="paragraph">
 <p>Varjo headsets provide extremely high pixel density displays in the center
 area of the display, blended with a high density display covering the rest
@@ -55141,7 +55815,7 @@ rendering.</p>
 </div>
 </div>
 <div class="sect3">
-<h4 id="_inspect_system_capability"><a class="anchor" href="#_inspect_system_capability"></a>12.72.2. Inspect system capability</h4>
+<h4 id="_inspect_system_capability"><a class="anchor" href="#_inspect_system_capability"></a>12.75.2. Inspect system capability</h4>
 <div class="openblock">
 <div class="content">
 <div class="paragraph">
@@ -55211,7 +55885,7 @@ An application <strong class="purple">should</strong> avoid using foveated rende
 </div>
 </div>
 <div class="sect3">
-<h4 id="_determine_foveated_texture_sizes"><a class="anchor" href="#_determine_foveated_texture_sizes"></a>12.72.3. Determine foveated texture sizes</h4>
+<h4 id="_determine_foveated_texture_sizes"><a class="anchor" href="#_determine_foveated_texture_sizes"></a>12.75.3. Determine foveated texture sizes</h4>
 <div class="openblock">
 <div class="content">
 <div class="paragraph">
@@ -55329,7 +56003,7 @@ rendering gaze is not available.</p>
 </div>
 </div>
 <div class="sect3">
-<h4 id="_rendering_gaze_status"><a class="anchor" href="#_rendering_gaze_status"></a>12.72.4. Rendering gaze status</h4>
+<h4 id="_rendering_gaze_status"><a class="anchor" href="#_rendering_gaze_status"></a>12.75.4. Rendering gaze status</h4>
 <div class="paragraph">
 <p>Extension defines new reference space type -
 <code>XR_REFERENCE_SPACE_TYPE_COMBINED_EYE_VARJO</code> which <strong class="purple">should</strong> be used to
@@ -55376,7 +56050,7 @@ if (foveationActive) {
 </div>
 </div>
 <div class="sect3">
-<h4 id="_request_foveated_field_of_view"><a class="anchor" href="#_request_foveated_field_of_view"></a>12.72.5. Request foveated field of view</h4>
+<h4 id="_request_foveated_field_of_view"><a class="anchor" href="#_request_foveated_field_of_view"></a>12.75.5. Request foveated field of view</h4>
 <div class="openblock">
 <div class="content">
 <div class="paragraph">
@@ -55542,7 +56216,7 @@ CHK_XR(xrLocateViews(session, &amp;viewLocateInfo, &amp;viewState, viewCapacityI
 </div>
 </div>
 <div class="sect2">
-<h3 id="XR_VARJO_quad_views"><a class="anchor" href="#XR_VARJO_quad_views"></a>12.73. XR_VARJO_quad_views</h3>
+<h3 id="XR_VARJO_quad_views"><a class="anchor" href="#XR_VARJO_quad_views"></a>12.76. XR_VARJO_quad_views</h3>
 <div class="dlist">
 <dl>
 <dt class="hdlist1"><strong>Name String</strong></dt>
@@ -55588,7 +56262,7 @@ Robert Menzel, NVIDIA</p>
 </dl>
 </div>
 <div class="sect3">
-<h4 id="_overview_7"><a class="anchor" href="#_overview_7"></a>12.73.1. Overview</h4>
+<h4 id="_overview_7"><a class="anchor" href="#_overview_7"></a>12.76.1. Overview</h4>
 <div class="paragraph">
 <p>This extension adds a new view configuration type -
 <code>XR_VIEW_CONFIGURATION_TYPE_PRIMARY_QUAD_VARJO</code> to
@@ -55687,11 +56361,11 @@ view.</p>
 <p><code><a href="#XR_EXTX_overlay">XR_EXTX_overlay</a></code></p>
 </li>
 <li>
-<p><code><a href="#XR_MNDX_egl_enable">XR_MNDX_egl_enable</a></code>
-&lt;&lt;&lt;</p>
+<p><code><a href="#XR_MNDX_egl_enable">XR_MNDX_egl_enable</a></code></p>
 </li>
 </ul>
 </div>
+<div style="page-break-after: always;"></div>
 <div class="sect2">
 <h3 id="XR_EXTX_overlay"><a class="anchor" href="#XR_EXTX_overlay"></a>13.1. XR_EXTX_overlay</h3>
 <div class="dlist">
@@ -56497,11 +57171,11 @@ type is <a href="#XR_USE_PLATFORM_EGL">XR_USE_PLATFORM_EGL</a>.</p>
 <div class="ulist">
 <ul>
 <li>
-<p><code><a href="#XR_MND_swapchain_usage_input_attachment_bit">XR_MND_swapchain_usage_input_attachment_bit</a></code>
-&lt;&lt;&lt;</p>
+<p><code><a href="#XR_MND_swapchain_usage_input_attachment_bit">XR_MND_swapchain_usage_input_attachment_bit</a></code></p>
 </li>
 </ul>
 </div>
+<div style="page-break-after: always;"></div>
 <div class="sect2">
 <h3 id="XR_MND_swapchain_usage_input_attachment_bit"><a class="anchor" href="#XR_MND_swapchain_usage_input_attachment_bit"></a>14.1. XR_MND_swapchain_usage_input_attachment_bit</h3>
 <div class="dlist">
@@ -56763,6 +57437,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrCompositionLayerSecureContentFlagBitsFB">XrCompositionLayerSecureContentFlagBitsFB</a></p>
 </li>
 <li>
+<p><a href="#XrCompositionLayerSpaceWarpInfoFlagBitsFB">XrCompositionLayerSpaceWarpInfoFlagBitsFB</a></p>
+</li>
+<li>
 <p><a href="#XrDebugUtilsMessageSeverityFlagBitsEXT">XrDebugUtilsMessageSeverityFlagBitsEXT</a></p>
 </li>
 <li>
@@ -56799,6 +57476,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrHandPoseTypeMSFT">XrHandPoseTypeMSFT</a></p>
 </li>
 <li>
+<p><a href="#XrHandTrackingAimFlagBitsFB">XrHandTrackingAimFlagBitsFB</a></p>
+</li>
+<li>
 <p><a href="#XrInputSourceLocalizedNameFlagBits">XrInputSourceLocalizedNameFlagBits</a></p>
 </li>
 <li>
@@ -56868,9 +57548,6 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrSpaceVelocityFlagBits">XrSpaceVelocityFlagBits</a></p>
 </li>
 <li>
-<p><a href="#XrSpatialAnchorExportPurposeMSFT">XrSpatialAnchorExportPurposeMSFT</a></p>
-</li>
-<li>
 <p><a href="#XrSpatialGraphNodeTypeMSFT">XrSpatialGraphNodeTypeMSFT</a></p>
 </li>
 <li>
@@ -56923,12 +57600,18 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrCompositionLayerSecureContentFlagsFB">XrCompositionLayerSecureContentFlagsFB</a>&#8201;&#8212;&#8201;See <a href="#XrCompositionLayerSecureContentFlagBitsFB">XrCompositionLayerSecureContentFlagBitsFB</a></p>
 </li>
 <li>
+<p><a href="#XrCompositionLayerSpaceWarpInfoFlagsFB">XrCompositionLayerSpaceWarpInfoFlagsFB</a>&#8201;&#8212;&#8201;See <a href="#XrCompositionLayerSpaceWarpInfoFlagBitsFB">XrCompositionLayerSpaceWarpInfoFlagBitsFB</a></p>
+</li>
+<li>
 <p><a href="#XrDebugUtilsMessageSeverityFlagsEXT">XrDebugUtilsMessageSeverityFlagsEXT</a>&#8201;&#8212;&#8201;See <a href="#XrDebugUtilsMessageSeverityFlagBitsEXT">XrDebugUtilsMessageSeverityFlagBitsEXT</a></p>
 </li>
 <li>
 <p><a href="#XrDebugUtilsMessageTypeFlagsEXT">XrDebugUtilsMessageTypeFlagsEXT</a>&#8201;&#8212;&#8201;See <a href="#XrDebugUtilsMessageTypeFlagBitsEXT">XrDebugUtilsMessageTypeFlagBitsEXT</a></p>
 </li>
 <li>
+<p><a href="#XrHandTrackingAimFlagsFB">XrHandTrackingAimFlagsFB</a>&#8201;&#8212;&#8201;See <a href="#XrHandTrackingAimFlagBitsFB">XrHandTrackingAimFlagBitsFB</a></p>
+</li>
+<li>
 <p><a href="#XrInputSourceLocalizedNameFlags">XrInputSourceLocalizedNameFlags</a>&#8201;&#8212;&#8201;See <a href="#XrInputSourceLocalizedNameFlagBits">XrInputSourceLocalizedNameFlagBits</a></p>
 </li>
 <li>
@@ -57069,9 +57752,6 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#xrCreateSpatialAnchorMSFT">xrCreateSpatialAnchorMSFT</a></p>
 </li>
 <li>
-<p><a href="#xrCreateSpatialAnchorNeighborhoodDataStreamMSFT">xrCreateSpatialAnchorNeighborhoodDataStreamMSFT</a></p>
-</li>
-<li>
 <p><a href="#xrCreateSpatialAnchorSpaceMSFT">xrCreateSpatialAnchorSpaceMSFT</a></p>
 </li>
 <li>
@@ -57129,10 +57809,10 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#xrDestroySpatialAnchorMSFT">xrDestroySpatialAnchorMSFT</a></p>
 </li>
 <li>
-<p><a href="#xrDestroySpatialAnchorNeighborhoodDataStreamMSFT">xrDestroySpatialAnchorNeighborhoodDataStreamMSFT</a></p>
+<p><a href="#xrDestroySpatialAnchorStoreConnectionMSFT">xrDestroySpatialAnchorStoreConnectionMSFT</a></p>
 </li>
 <li>
-<p><a href="#xrDestroySpatialAnchorStoreConnectionMSFT">xrDestroySpatialAnchorStoreConnectionMSFT</a></p>
+<p><a href="#xrDestroySpatialGraphStaticNodeBindingMSFT">xrDestroySpatialGraphStaticNodeBindingMSFT</a></p>
 </li>
 <li>
 <p><a href="#xrDestroySwapchain">xrDestroySwapchain</a></p>
@@ -57225,6 +57905,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#xrGetDisplayRefreshRateFB">xrGetDisplayRefreshRateFB</a></p>
 </li>
 <li>
+<p><a href="#xrGetHandMeshFB">xrGetHandMeshFB</a></p>
+</li>
+<li>
 <p><a href="#xrGetInputSourceLocalizedName">xrGetInputSourceLocalizedName</a></p>
 </li>
 <li>
@@ -57255,7 +57938,7 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#xrGetSerializedSceneFragmentDataMSFT">xrGetSerializedSceneFragmentDataMSFT</a></p>
 </li>
 <li>
-<p><a href="#xrGetSpatialAnchorExportSufficiencyMSFT">xrGetSpatialAnchorExportSufficiencyMSFT</a></p>
+<p><a href="#xrGetSpatialGraphStaticNodeBindingPropertiesMSFT">xrGetSpatialGraphStaticNodeBindingPropertiesMSFT</a></p>
 </li>
 <li>
 <p><a href="#xrGetSwapchainStateFB">xrGetSwapchainStateFB</a></p>
@@ -57318,9 +58001,6 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#xrPollEvent">xrPollEvent</a></p>
 </li>
 <li>
-<p><a href="#xrReadSpatialAnchorNeighborhoodDataMSFT">xrReadSpatialAnchorNeighborhoodDataMSFT</a></p>
-</li>
-<li>
 <p><a href="#xrReleaseSwapchainImage">xrReleaseSwapchainImage</a></p>
 </li>
 <li>
@@ -57390,6 +58070,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#xrThermalGetTemperatureTrendEXT">xrThermalGetTemperatureTrendEXT</a></p>
 </li>
 <li>
+<p><a href="#xrTryCreateSpatialGraphStaticNodeBindingMSFT">xrTryCreateSpatialGraphStaticNodeBindingMSFT</a></p>
+</li>
+<li>
 <p><a href="#xrTryGetPerceptionAnchorFromSpatialAnchorMSFT">xrTryGetPerceptionAnchorFromSpatialAnchorMSFT</a></p>
 </li>
 <li>
@@ -57448,10 +58131,10 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrSpatialAnchorMSFT">XrSpatialAnchorMSFT</a></p>
 </li>
 <li>
-<p><a href="#XrSpatialAnchorNeighborhoodDataStreamMSFT">XrSpatialAnchorNeighborhoodDataStreamMSFT</a></p>
+<p><a href="#XrSpatialAnchorStoreConnectionMSFT">XrSpatialAnchorStoreConnectionMSFT</a></p>
 </li>
 <li>
-<p><a href="#XrSpatialAnchorStoreConnectionMSFT">XrSpatialAnchorStoreConnectionMSFT</a></p>
+<p><a href="#XrSpatialGraphStaticNodeBindingMSFT">XrSpatialGraphStaticNodeBindingMSFT</a></p>
 </li>
 <li>
 <p><a href="#XrSwapchain">XrSwapchain</a></p>
@@ -57572,6 +58255,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrCompositionLayerSecureContentFB">XrCompositionLayerSecureContentFB</a></p>
 </li>
 <li>
+<p><a href="#XrCompositionLayerSpaceWarpInfoFB">XrCompositionLayerSpaceWarpInfoFB</a></p>
+</li>
+<li>
 <p><a href="#XrControllerModelKeyStateMSFT">XrControllerModelKeyStateMSFT</a></p>
 </li>
 <li>
@@ -57719,6 +58405,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrGraphicsRequirementsVulkanKHR">XrGraphicsRequirementsVulkanKHR</a></p>
 </li>
 <li>
+<p><a href="#XrHandCapsuleFB">XrHandCapsuleFB</a></p>
+</li>
+<li>
 <p><a href="#XrHandJointLocationEXT">XrHandJointLocationEXT</a></p>
 </li>
 <li>
@@ -57761,6 +58450,18 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrHandTrackerCreateInfoEXT">XrHandTrackerCreateInfoEXT</a></p>
 </li>
 <li>
+<p><a href="#XrHandTrackingAimStateFB">XrHandTrackingAimStateFB</a></p>
+</li>
+<li>
+<p><a href="#XrHandTrackingCapsulesStateFB">XrHandTrackingCapsulesStateFB</a></p>
+</li>
+<li>
+<p><a href="#XrHandTrackingMeshFB">XrHandTrackingMeshFB</a></p>
+</li>
+<li>
+<p><a href="#XrHandTrackingScaleFB">XrHandTrackingScaleFB</a></p>
+</li>
+<li>
 <p><a href="#XrHapticActionInfo">XrHapticActionInfo</a></p>
 </li>
 <li>
@@ -57947,12 +58648,6 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrSpatialAnchorCreateInfoMSFT">XrSpatialAnchorCreateInfoMSFT</a></p>
 </li>
 <li>
-<p><a href="#XrSpatialAnchorExportPurposeInfoMSFT">XrSpatialAnchorExportPurposeInfoMSFT</a></p>
-</li>
-<li>
-<p><a href="#XrSpatialAnchorExportSufficiencyMSFT">XrSpatialAnchorExportSufficiencyMSFT</a></p>
-</li>
-<li>
 <p><a href="#XrSpatialAnchorFromPersistedAnchorCreateInfoMSFT">XrSpatialAnchorFromPersistedAnchorCreateInfoMSFT</a></p>
 </li>
 <li>
@@ -57968,6 +58663,15 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrSpatialGraphNodeSpaceCreateInfoMSFT">XrSpatialGraphNodeSpaceCreateInfoMSFT</a></p>
 </li>
 <li>
+<p><a href="#XrSpatialGraphStaticNodeBindingCreateInfoMSFT">XrSpatialGraphStaticNodeBindingCreateInfoMSFT</a></p>
+</li>
+<li>
+<p><a href="#XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT">XrSpatialGraphStaticNodeBindingPropertiesGetInfoMSFT</a></p>
+</li>
+<li>
+<p><a href="#XrSpatialGraphStaticNodeBindingPropertiesMSFT">XrSpatialGraphStaticNodeBindingPropertiesMSFT</a></p>
+</li>
+<li>
 <p><a href="#XrSwapchainCreateInfo">XrSwapchainCreateInfo</a></p>
 </li>
 <li>
@@ -58049,6 +58753,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrSystemProperties">XrSystemProperties</a></p>
 </li>
 <li>
+<p><a href="#XrSystemSpaceWarpPropertiesFB">XrSystemSpaceWarpPropertiesFB</a></p>
+</li>
+<li>
 <p><a href="#XrSystemTrackingProperties">XrSystemTrackingProperties</a></p>
 </li>
 <li>
@@ -58064,6 +58771,9 @@ At the time of writing this bit only affects Vulkan swapchains.</p>
 <p><a href="#XrVector4f">XrVector4f</a></p>
 </li>
 <li>
+<p><a href="#XrVector4sFB">XrVector4sFB</a></p>
+</li>
+<li>
 <p><a href="#XrView">XrView</a></p>
 </li>
 <li>
@@ -58298,7 +59008,6 @@ the application binary interface.</p>
     XR_TYPE_COMPOSITION_LAYER_ALPHA_BLEND_FB = 1000041001,
     XR_TYPE_VIEW_CONFIGURATION_DEPTH_RANGE_EXT = 1000046000,
     XR_TYPE_GRAPHICS_BINDING_EGL_MNDX = 1000048004,
-    XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT = 1000049000,
     XR_TYPE_SYSTEM_HAND_TRACKING_PROPERTIES_EXT = 1000051000,
     XR_TYPE_HAND_TRACKER_CREATE_INFO_EXT = 1000051001,
     XR_TYPE_HAND_JOINTS_LOCATE_INFO_EXT = 1000051002,
@@ -58356,6 +59065,10 @@ the application binary interface.</p>
     XR_TYPE_SCENE_DESERIALIZE_INFO_MSFT = 1000098001,
     XR_TYPE_EVENT_DATA_DISPLAY_REFRESH_RATE_CHANGED_FB = 1000101000,
     XR_TYPE_SYSTEM_COLOR_SPACE_PROPERTIES_FB = 1000108000,
+    XR_TYPE_HAND_TRACKING_MESH_FB = 1000110001,
+    XR_TYPE_HAND_TRACKING_SCALE_FB = 1000110003,
+    XR_TYPE_HAND_TRACKING_AIM_STATE_FB = 1000111001,
+    XR_TYPE_HAND_TRACKING_CAPSULES_STATE_FB = 1000112000,
     XR_TYPE_FOVEATION_PROFILE_CREATE_INFO_FB = 1000114000,
     XR_TYPE_SWAPCHAIN_CREATE_INFO_FOVEATION_FB = 1000114001,
     XR_TYPE_SWAPCHAIN_STATE_FOVEATION_FB = 1000114002,
@@ -58371,8 +59084,12 @@ the application binary interface.</p>
     XR_TYPE_SWAPCHAIN_STATE_ANDROID_SURFACE_DIMENSIONS_FB = 1000161000,
     XR_TYPE_SWAPCHAIN_STATE_SAMPLER_OPENGL_ES_FB = 1000162000,
     XR_TYPE_SWAPCHAIN_STATE_SAMPLER_VULKAN_FB = 1000163000,
-    XR_TYPE_SPATIAL_ANCHOR_EXPORT_PURPOSE_INFO_MSFT = 1000062000,
-    XR_TYPE_SPATIAL_ANCHOR_EXPORT_SUFFICIENCY_MSFT = 1000062001,
+    XR_TYPE_COMPOSITION_LAYER_SPACE_WARP_INFO_FB = 1000171000,
+    XR_TYPE_SYSTEM_SPACE_WARP_PROPERTIES_FB = 1000171001,
+    XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT = 1000049000,
+    XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_CREATE_INFO_MSFT = 1000049001,
+    XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_GET_INFO_MSFT = 1000049002,
+    XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_MSFT = 1000049003,
     XR_TYPE_GRAPHICS_BINDING_VULKAN2_KHR = XR_TYPE_GRAPHICS_BINDING_VULKAN_KHR,
     XR_TYPE_SWAPCHAIN_IMAGE_VULKAN2_KHR = XR_TYPE_SWAPCHAIN_IMAGE_VULKAN_KHR,
     XR_TYPE_GRAPHICS_REQUIREMENTS_VULKAN2_KHR = XR_TYPE_GRAPHICS_REQUIREMENTS_VULKAN_KHR,
@@ -58526,7 +59243,7 @@ Macros</a>.</p>
 <div class="listingblock">
 <div class="content">
 <pre class="prettyprint highlight"><code data-lang="c++">// OpenXR current version number.
-#define XR_CURRENT_API_VERSION XR_MAKE_VERSION(1, 0, 18)</code></pre>
+#define XR_CURRENT_API_VERSION XR_MAKE_VERSION(1, 0, 19)</code></pre>
 </div>
 </div>
 <div class="paragraph">
@@ -59456,8 +60173,8 @@ the time of their most recent contribution, are listed below.</p>
 </div>
 <div id="footer" style="max-width: 100;">
 <div id="footer-text">
-Version 1.0.18<br>
-Last updated 2021-07-16 15:53:09 -0700
+Version 1.0.19<br>
+Last updated 2021-09-13 19:29:07 -0700
 </div>
 </div>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/run_prettify.min.js"></script>
diff --git a/shared/XrSceneLib/ProjectionLayer.cpp b/shared/XrSceneLib/ProjectionLayer.cpp
index 16f98b0..d1d66d8 100644
--- a/shared/XrSceneLib/ProjectionLayer.cpp
+++ b/shared/XrSceneLib/ProjectionLayer.cpp
@@ -34,6 +34,13 @@ engine::ProjectionLayer::ProjectionLayer(const sample::SessionContext& sessionCo
     }
 }
 
+void engine::ProjectionLayer::DestroySwapchains() {
+    for (auto& viewConfigComponent : m_viewConfigComponents) {
+        viewConfigComponent.second.ColorSwapchain = {};
+        viewConfigComponent.second.DepthSwapchain = {};
+    }
+}
+
 void engine::ProjectionLayer::PrepareRendering(const Context& context,
                                                XrViewConfigurationType viewConfigType,
                                                const std::vector<XrViewConfigurationView>& viewConfigViews) {
diff --git a/shared/XrSceneLib/ProjectionLayer.h b/shared/XrSceneLib/ProjectionLayer.h
index 2abab1f..5ab45c0 100644
--- a/shared/XrSceneLib/ProjectionLayer.h
+++ b/shared/XrSceneLib/ProjectionLayer.h
@@ -68,6 +68,8 @@ namespace engine {
                     const std::vector<std::unique_ptr<Scene>>& activeScenes,
                     XrViewConfigurationType viewConfig);
 
+        void DestroySwapchains();
+
     private:
         struct ViewConfigComponent {
             ProjectionLayerConfig CurrentConfig;
diff --git a/shared/XrSceneLib/QuadLayerObject.h b/shared/XrSceneLib/QuadLayerObject.h
index e7d44d0..6265bfe 100644
--- a/shared/XrSceneLib/QuadLayerObject.h
+++ b/shared/XrSceneLib/QuadLayerObject.h
@@ -20,9 +20,10 @@ namespace engine {
         XrCompositionLayerFlags CompositionLayerFlags{};
         XrEyeVisibility EyeVisibility{XR_EYE_VISIBILITY_BOTH};
         LayerGrouping LayerGroup = LayerGrouping::Overlay;
+        DirectX::XMFLOAT4 ColorScale = {1, 1, 1, 1};
+        DirectX::XMFLOAT4 ColorBias = {0, 0, 0, 0};
     };
 
     std::shared_ptr<QuadLayerObject> CreateQuadLayerObject(XrSpace space, XrSwapchainSubImage image);
 
 } // namespace engine
-
diff --git a/shared/XrSceneLib/XrApp.cpp b/shared/XrSceneLib/XrApp.cpp
index 00b97b0..fd7b1af 100644
--- a/shared/XrSceneLib/XrApp.cpp
+++ b/shared/XrSceneLib/XrApp.cpp
@@ -456,6 +456,9 @@ namespace {
     void ImplementXrApp::EndSession() {
         StopRenderThreadIfRunning();
         m_sessionRunning = false;
+
+        m_projectionLayers.ForEachLayerWithLock([this](auto&& layer) { layer.DestroySwapchains(); });
+
         CHECK_XRCMD(xrEndSession(Context().Session.Handle));
     }
 
diff --git a/shared/XrUtility/XrActionContext.h b/shared/XrUtility/XrActionContext.h
deleted file mode 100644
index 1dd5a6a..0000000
--- a/shared/XrUtility/XrActionContext.h
+++ /dev/null
@@ -1,175 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-
-#pragma once
-
-#include <set>
-#include <list>
-#include <unordered_map>
-
-#include "XrString.h"
-#include "XrHandle.h"
-
-namespace xr {
-    class ActionSet {
-    public:
-        ActionSet(XrInstance instance, const char* name, const char* localizedName, uint32_t priority = 0)
-            : m_instance(instance) {
-            XrActionSetCreateInfo actionSetCreateInfo{XR_TYPE_ACTION_SET_CREATE_INFO};
-            strcpy_s(actionSetCreateInfo.actionSetName, name);
-            strcpy_s(actionSetCreateInfo.localizedActionSetName, localizedName);
-            actionSetCreateInfo.priority = priority;
-            CHECK_XRCMD(xrCreateActionSet(m_instance, &actionSetCreateInfo, m_actionSet.Put()));
-        }
-
-        XrAction CreateAction(const char* actionName,
-                              const char* localizedName,
-                              XrActionType actionType,
-                              const std::vector<std::string>& subactionPaths) {
-            std::vector<XrPath> subActionXrPaths = xr::StringsToPaths(m_instance, subactionPaths);
-
-            XrActionCreateInfo actionCreateInfo{XR_TYPE_ACTION_CREATE_INFO};
-            actionCreateInfo.actionType = actionType;
-            actionCreateInfo.countSubactionPaths = static_cast<uint32_t>(subActionXrPaths.size());
-            actionCreateInfo.subactionPaths = subActionXrPaths.data();
-            strcpy_s(actionCreateInfo.actionName, actionName);
-            strcpy_s(actionCreateInfo.localizedActionName, localizedName);
-
-            for (XrPath subactionPath : subActionXrPaths) {
-                m_declaredSubactionPaths.insert(subactionPath); // std::set will remove duplication.
-            }
-
-            xr::ActionHandle action;
-            CHECK_XRCMD(xrCreateAction(m_actionSet.Get(), &actionCreateInfo, action.Put()));
-
-            m_actions.push_back(std::move(action));
-
-            return m_actions.back().Get();
-        }
-
-        bool Active() const {
-            return m_active;
-        }
-        void SetActive(bool active) {
-            m_active = active;
-        }
-
-        XrActionSet Handle() const {
-            return m_actionSet.Get();
-        }
-
-        const std::set<XrPath>& DeclaredSubactionPaths() const {
-            return m_declaredSubactionPaths;
-        }
-
-    private:
-        const XrInstance m_instance;
-        xr::ActionSetHandle m_actionSet;
-        std::vector<xr::ActionHandle> m_actions;
-        bool m_active{true};
-        std::set<XrPath> m_declaredSubactionPaths;
-    };
-
-    //
-    // OpenXR requires one xrSuggestInteractionProfileBindings call for each interaction profile
-    // and one xrAttachSessionActionSets for each session.
-    // The xrSyncActions call must be done for all active actionset together.
-    // ActionContext class collects action and actionset metadata from multiple places in an app
-    // and finalize the binding and attach to session together.
-    //
-    struct ActionContext {
-        struct ActionBinding {
-            XrAction action;
-            std::string binding;
-        };
-
-        explicit ActionContext(XrInstance instance)
-            : m_instance(instance) {
-        }
-
-        ActionSet& CreateActionSet(const char* name, const char* localizedName, uint32_t priority = 0) {
-            return m_actionSets.emplace_back(ActionSet{m_instance, name, localizedName, priority});
-        }
-
-        void SuggestInteractionProfileBindings(const char* interactionProfile, const std::vector<ActionBinding>& suggestedBindings) {
-            const XrPath profilePath = xr::StringToPath(m_instance, interactionProfile);
-            for (const auto& actionBinding : suggestedBindings) {
-                m_actionBindings[profilePath].emplace_back(actionBinding);
-            }
-        }
-
-    private:
-        XrInstance m_instance;
-        std::list<ActionSet> m_actionSets;
-        std::unordered_map<XrPath /*interaction profile*/, std::vector<ActionBinding>> m_actionBindings;
-
-        friend void AttachActionsToSession(XrInstance instance,
-                                           XrSession session,
-                                           const std::vector<const xr::ActionContext*>& actionContexts);
-        friend void SyncActions(XrSession session, const std::vector<const xr::ActionContext*>& actionContexts);
-    };
-
-    inline void AttachActionsToSession(XrInstance instance,
-                                       XrSession session,
-                                       const std::vector<const xr::ActionContext*>& actionContexts) {
-        // Collect action bindings for each context and summarize using interaction profile path as key.
-        std::unordered_map<XrPath, std::vector<XrActionSuggestedBinding>> allBindings;
-        for (const xr::ActionContext* actionContext : actionContexts) {
-            for (const auto& [profilePath, stringBindings] : actionContext->m_actionBindings) {
-                for (const auto& [actionPath, binding] : stringBindings) {
-                    allBindings[profilePath].emplace_back(
-                        XrActionSuggestedBinding{actionPath, xr::StringToPath(instance, binding.c_str())});
-                }
-            }
-        }
-
-        for (const auto& [interactionProfile, suggestedBindings] : allBindings) {
-            XrInteractionProfileSuggestedBinding bindings{XR_TYPE_INTERACTION_PROFILE_SUGGESTED_BINDING};
-            bindings.interactionProfile = interactionProfile;
-            bindings.suggestedBindings = suggestedBindings.data();
-            bindings.countSuggestedBindings = static_cast<uint32_t>(suggestedBindings.size());
-            CHECK_XRCMD(xrSuggestInteractionProfileBindings(instance, &bindings));
-        }
-
-        std::vector<XrActionSet> actionSetHandles;
-        for (const xr::ActionContext* actionContext : actionContexts) {
-            for (const xr::ActionSet& actionSet : actionContext->m_actionSets) {
-                actionSetHandles.push_back(actionSet.Handle());
-            }
-        }
-
-        if (!std::empty(actionSetHandles)) {
-            XrSessionActionSetsAttachInfo attachInfo{XR_TYPE_SESSION_ACTION_SETS_ATTACH_INFO};
-            attachInfo.countActionSets = static_cast<uint32_t>(std::size(actionSetHandles));
-            attachInfo.actionSets = actionSetHandles.data();
-            CHECK_XRCMD(xrAttachSessionActionSets(session, &attachInfo));
-        }
-    }
-
-    inline void SyncActions(XrSession session, const std::vector<const xr::ActionContext*>& actionContexts) {
-        std::vector<XrActiveActionSet> activeActionSets;
-
-        for (const xr::ActionContext* actionContext : actionContexts) {
-            for (const xr::ActionSet& actionSet : actionContext->m_actionSets) {
-                if (!actionSet.Active()) {
-                    continue;
-                }
-                if (std::empty(actionSet.DeclaredSubactionPaths())) {
-                    activeActionSets.emplace_back(XrActiveActionSet{actionSet.Handle(), XR_NULL_PATH});
-                } else {
-                    for (const XrPath& subactionPath : actionSet.DeclaredSubactionPaths()) {
-                        activeActionSets.emplace_back(XrActiveActionSet{actionSet.Handle(), subactionPath});
-                    }
-                }
-            }
-        }
-
-        if (!activeActionSets.empty()) {
-            XrActionsSyncInfo syncInfo{XR_TYPE_ACTIONS_SYNC_INFO};
-            syncInfo.countActiveActionSets = static_cast<uint32_t>(std::size(activeActionSets));
-            syncInfo.activeActionSets = activeActionSets.data();
-            CHECK_XRCMD(xrSyncActions(session, &syncInfo));
-        }
-    }
-
-} // namespace xr
diff --git a/shared/XrUtility/XrError.h b/shared/XrUtility/XrError.h
index c8bf272..0fced4c 100644
--- a/shared/XrUtility/XrError.h
+++ b/shared/XrUtility/XrError.h
@@ -5,7 +5,11 @@
 
 #include <memory>
 #include <stdexcept>
+#include <stdarg.h>
 #include "XrToString.h"
+#ifdef _WIN32
+#include <windows.h>
+#endif
 
 #define CHECK_XRCMD(cmd) xr::detail::_CheckXrResult(cmd, #cmd, FILE_AND_LINE)
 #define CHECK_XRRESULT(res, cmdStr) xr::detail::_CheckXrResult(res, cmdStr, FILE_AND_LINE)
diff --git a/shared/XrUtility/XrExtensionContext.h b/shared/XrUtility/XrExtensionContext.h
index 8cfeb47..a72af89 100644
--- a/shared/XrUtility/XrExtensionContext.h
+++ b/shared/XrUtility/XrExtensionContext.h
@@ -9,32 +9,37 @@
 
 namespace xr {
     struct ExtensionContext : xr::ExtensionDispatchTable {
-        bool SupportsD3D11;
-        bool SupportsD3D12;
-        bool SupportsDepthInfo;
-        bool SupportsVisibilityMask;
-        bool SupportsUnboundedSpace;
-        bool SupportsSpatialAnchor;
-        bool SupportsHandInteraction;
-        bool SupportsEyeGazeInteraction;
-        bool SupportsHandJointTracking;
-        bool SupportsHandMeshTracking;
-        bool SupportsSpatialGraphBridge;
-        bool SupportsControllerModel;
-        bool SupportsSecondaryViewConfiguration;
-        bool SupportsAppContainer;
-        bool SupportsHolographicWindowAttachment;
-        bool SupportsSamsungOdysseyController;
-        bool SupportsHPMixedRealityController;
-        bool SupportsSpatialAnchorExport;
-        bool SupportsSpatialAnchorPersistence;
-        bool SupportsPerceptionAnchorInterop;
-        bool SupportsColorScaleBias;
-        bool SupportsSceneUnderstanding;
-        bool SupportsSceneUnderstandingSerialization;
-        bool SupportsReprojectionConfiguration;
+        bool SupportsD3D11{false};
+        bool SupportsD3D12{false};
+        bool SupportsDepthInfo{false};
+        bool SupportsVisibilityMask{false};
+        bool SupportsUnboundedSpace{false};
+        bool SupportsSpatialAnchor{false};
+        bool SupportsHandInteraction{false};
+        bool SupportsEyeGazeInteraction{false};
+        bool SupportsHandJointTracking{false};
+        bool SupportsHandMeshTracking{false};
+        bool SupportsSpatialGraphBridge{false};
+        bool SupportsControllerModel{false};
+        bool SupportsSecondaryViewConfiguration{false};
+        bool SupportsAppContainer{false};
+        bool SupportsHolographicWindowAttachment{false};
+        bool SupportsSamsungOdysseyController{false};
+        bool SupportsHPMixedRealityController{false};
+        bool SupportsSpatialAnchorPersistence{false};
+        bool SupportsPerceptionAnchorInterop{false};
+        bool SupportsColorScaleBias{false};
+        bool SupportsSceneUnderstanding{false};
+        bool SupportsSceneUnderstandingSerialization{false};
+        bool SupportsReprojectionConfiguration{false};
 
         std::vector<const char*> EnabledExtensions;
+
+        inline bool IsEnabled(const char* extensionName) const {
+            const auto it = std::find_if(
+                EnabledExtensions.begin(), EnabledExtensions.end(), [&extensionName](auto&& i) { return 0 == strcmp(i, extensionName); });
+            return it != EnabledExtensions.end();
+        }
     };
 
     inline ExtensionContext CreateExtensionContext(const std::vector<const char*>& requestedExtensions) {
@@ -51,44 +56,37 @@ namespace xr {
             }
         }
 
-        auto isExtensionEnabled = [&list = extensions.EnabledExtensions](const char* extensionName) -> bool {
-            return list.end() !=
-                   std::find_if(list.begin(), list.end(), [&extensionName](auto&& i) { return 0 == strcmp(i, extensionName); });
-        };
-
         // Record enabled extensions in extension context as bool for easy usage.
 #ifdef XR_USE_GRAPHICS_API_D3D11
-        extensions.SupportsD3D11 = isExtensionEnabled(XR_KHR_D3D11_ENABLE_EXTENSION_NAME);
+        extensions.SupportsD3D11 = extensions.IsEnabled(XR_KHR_D3D11_ENABLE_EXTENSION_NAME);
 #endif
 #ifdef XR_USE_GRAPHICS_API_D3D12
-        extensions.SupportsD3D12 = isExtensionEnabled(XR_KHR_D3D12_ENABLE_EXTENSION_NAME);
+        extensions.SupportsD3D12 = extensions.IsEnabled(XR_KHR_D3D12_ENABLE_EXTENSION_NAME);
 #endif
 #ifdef XR_USE_PLATFORM_WIN32
-        extensions.SupportsAppContainer = isExtensionEnabled(XR_EXT_WIN32_APPCONTAINER_COMPATIBLE_EXTENSION_NAME);
-        extensions.SupportsHolographicWindowAttachment = isExtensionEnabled(XR_MSFT_HOLOGRAPHIC_WINDOW_ATTACHMENT_EXTENSION_NAME);
-        extensions.SupportsPerceptionAnchorInterop = isExtensionEnabled(XR_MSFT_PERCEPTION_ANCHOR_INTEROP_EXTENSION_NAME);
+        extensions.SupportsAppContainer = extensions.IsEnabled(XR_EXT_WIN32_APPCONTAINER_COMPATIBLE_EXTENSION_NAME);
+        extensions.SupportsHolographicWindowAttachment = extensions.IsEnabled(XR_MSFT_HOLOGRAPHIC_WINDOW_ATTACHMENT_EXTENSION_NAME);
+        extensions.SupportsPerceptionAnchorInterop = extensions.IsEnabled(XR_MSFT_PERCEPTION_ANCHOR_INTEROP_EXTENSION_NAME);
 #endif
-        extensions.SupportsDepthInfo = isExtensionEnabled(XR_KHR_COMPOSITION_LAYER_DEPTH_EXTENSION_NAME);
-        extensions.SupportsVisibilityMask = isExtensionEnabled(XR_KHR_VISIBILITY_MASK_EXTENSION_NAME);
-        extensions.SupportsUnboundedSpace = isExtensionEnabled(XR_MSFT_UNBOUNDED_REFERENCE_SPACE_EXTENSION_NAME);
-        extensions.SupportsSpatialAnchor = isExtensionEnabled(XR_MSFT_SPATIAL_ANCHOR_EXTENSION_NAME);
-        extensions.SupportsHandInteraction = isExtensionEnabled(XR_MSFT_HAND_INTERACTION_EXTENSION_NAME);
-        extensions.SupportsEyeGazeInteraction = isExtensionEnabled(XR_EXT_EYE_GAZE_INTERACTION_EXTENSION_NAME);
-        extensions.SupportsSecondaryViewConfiguration = isExtensionEnabled(XR_MSFT_SECONDARY_VIEW_CONFIGURATION_EXTENSION_NAME);
-        extensions.SupportsHandJointTracking = isExtensionEnabled(XR_EXT_HAND_TRACKING_EXTENSION_NAME);
-        extensions.SupportsHandMeshTracking = isExtensionEnabled(XR_MSFT_HAND_TRACKING_MESH_EXTENSION_NAME);
-        extensions.SupportsSpatialGraphBridge = isExtensionEnabled(XR_MSFT_SPATIAL_GRAPH_BRIDGE_EXTENSION_NAME);
-        extensions.SupportsControllerModel = isExtensionEnabled(XR_MSFT_CONTROLLER_MODEL_EXTENSION_NAME);
-        extensions.SupportsSamsungOdysseyController = isExtensionEnabled(XR_EXT_SAMSUNG_ODYSSEY_CONTROLLER_EXTENSION_NAME);
-        extensions.SupportsHPMixedRealityController = isExtensionEnabled(XR_EXT_HP_MIXED_REALITY_CONTROLLER_EXTENSION_NAME);
-        extensions.SupportsColorScaleBias = isExtensionEnabled(XR_KHR_COMPOSITION_LAYER_COLOR_SCALE_BIAS_EXTENSION_NAME);
-        extensions.SupportsSceneUnderstanding = isExtensionEnabled(XR_MSFT_SCENE_UNDERSTANDING_EXTENSION_NAME);
-        extensions.SupportsSceneUnderstandingSerialization = isExtensionEnabled(XR_MSFT_SCENE_UNDERSTANDING_SERIALIZATION_EXTENSION_NAME);
-        extensions.SupportsReprojectionConfiguration = isExtensionEnabled(XR_MSFT_COMPOSITION_LAYER_REPROJECTION_EXTENSION_NAME);
-        extensions.SupportsSpatialAnchorExport = isExtensionEnabled(XR_MSFT_SPATIAL_ANCHOR_EXPORT_PREVIEW_EXTENSION_NAME);
-        extensions.SupportsSpatialAnchorPersistence = isExtensionEnabled(XR_MSFT_SPATIAL_ANCHOR_PERSISTENCE_EXTENSION_NAME);
+        extensions.SupportsDepthInfo = extensions.IsEnabled(XR_KHR_COMPOSITION_LAYER_DEPTH_EXTENSION_NAME);
+        extensions.SupportsVisibilityMask = extensions.IsEnabled(XR_KHR_VISIBILITY_MASK_EXTENSION_NAME);
+        extensions.SupportsUnboundedSpace = extensions.IsEnabled(XR_MSFT_UNBOUNDED_REFERENCE_SPACE_EXTENSION_NAME);
+        extensions.SupportsSpatialAnchor = extensions.IsEnabled(XR_MSFT_SPATIAL_ANCHOR_EXTENSION_NAME);
+        extensions.SupportsHandInteraction = extensions.IsEnabled(XR_MSFT_HAND_INTERACTION_EXTENSION_NAME);
+        extensions.SupportsEyeGazeInteraction = extensions.IsEnabled(XR_EXT_EYE_GAZE_INTERACTION_EXTENSION_NAME);
+        extensions.SupportsSecondaryViewConfiguration = extensions.IsEnabled(XR_MSFT_SECONDARY_VIEW_CONFIGURATION_EXTENSION_NAME);
+        extensions.SupportsHandJointTracking = extensions.IsEnabled(XR_EXT_HAND_TRACKING_EXTENSION_NAME);
+        extensions.SupportsHandMeshTracking = extensions.IsEnabled(XR_MSFT_HAND_TRACKING_MESH_EXTENSION_NAME);
+        extensions.SupportsSpatialGraphBridge = extensions.IsEnabled(XR_MSFT_SPATIAL_GRAPH_BRIDGE_EXTENSION_NAME);
+        extensions.SupportsControllerModel = extensions.IsEnabled(XR_MSFT_CONTROLLER_MODEL_EXTENSION_NAME);
+        extensions.SupportsSamsungOdysseyController = extensions.IsEnabled(XR_EXT_SAMSUNG_ODYSSEY_CONTROLLER_EXTENSION_NAME);
+        extensions.SupportsHPMixedRealityController = extensions.IsEnabled(XR_EXT_HP_MIXED_REALITY_CONTROLLER_EXTENSION_NAME);
+        extensions.SupportsColorScaleBias = extensions.IsEnabled(XR_KHR_COMPOSITION_LAYER_COLOR_SCALE_BIAS_EXTENSION_NAME);
+        extensions.SupportsSceneUnderstanding = extensions.IsEnabled(XR_MSFT_SCENE_UNDERSTANDING_EXTENSION_NAME);
+        extensions.SupportsSceneUnderstandingSerialization = extensions.IsEnabled(XR_MSFT_SCENE_UNDERSTANDING_SERIALIZATION_EXTENSION_NAME);
+        extensions.SupportsReprojectionConfiguration = extensions.IsEnabled(XR_MSFT_COMPOSITION_LAYER_REPROJECTION_EXTENSION_NAME);
+        extensions.SupportsSpatialAnchorPersistence = extensions.IsEnabled(XR_MSFT_SPATIAL_ANCHOR_PERSISTENCE_EXTENSION_NAME);
 
         return extensions;
     }
 } // namespace xr
-
diff --git a/shared/XrUtility/XrExtensions.h b/shared/XrUtility/XrExtensions.h
index 2644060..676df78 100644
--- a/shared/XrUtility/XrExtensions.h
+++ b/shared/XrUtility/XrExtensions.h
@@ -58,7 +58,11 @@
 #endif
 
 #if XR_MSFT_spatial_graph_bridge
-#define FOR_EACH_SPATIAL_GRAPH_BRIDGE_FUNCTION(_) _(xrCreateSpatialGraphNodeSpaceMSFT)
+#define FOR_EACH_SPATIAL_GRAPH_BRIDGE_FUNCTION(_)   \
+    _(xrCreateSpatialGraphNodeSpaceMSFT)            \
+    _(xrTryCreateSpatialGraphStaticNodeBindingMSFT) \
+    _(xrDestroySpatialGraphStaticNodeBindingMSFT)   \
+    _(xrGetSpatialGraphStaticNodeBindingPropertiesMSFT)
 #else
 #define FOR_EACH_SPATIAL_GRAPH_BRIDGE_FUNCTION(_)
 #endif
@@ -91,21 +95,10 @@
 #define FOR_EACH_SCENE_UNDERSTANDING_SERIALIZATION_FUNCTION(_) \
     _(xrDeserializeSceneMSFT)                                  \
     _(xrGetSerializedSceneFragmentDataMSFT)
-
 #else
 #define FOR_EACH_SCENE_UNDERSTANDING_SERIALIZATION_FUNCTION(_)
 #endif
 
-#if XR_MSFT_spatial_anchor_export_preview
-#define FOR_EACH_SPATIAL_ANCHOR_EXPORT_FUNCTION(_)     \
-    _(xrCreateSpatialAnchorNeighborhoodDataStreamMSFT) \
-    _(xrReadSpatialAnchorNeighborhoodDataMSFT)         \
-    _(xrGetSpatialAnchorExportSufficiencyMSFT)         \
-    _(xrDestroySpatialAnchorNeighborhoodDataStreamMSFT)
-#else
-#define FOR_EACH_PERCEPTION_ANCHOR_INTEROP_FUNCTION(_)
-#endif
-
 #if XR_MSFT_spatial_anchor_persistence
 #define FOR_EACH_SPATIAL_ANCHOR_PERSISTENCE_FUNCTION(_) \
     _(xrCreateSpatialAnchorStoreConnectionMSFT)         \
@@ -119,7 +112,11 @@
 #define FOR_EACH_SPATIAL_ANCHOR_PERSISTENCE_FUNCTION(_)
 #endif
 
+#if XR_MSFT_composition_layer_reprojection
 #define FOR_EACH_COMPOSITION_LAYER_REPROJECTION_FUNCTION(_) _(xrEnumerateReprojectionModesMSFT)
+#else
+#define FOR_EACH_COMPOSITION_LAYER_REPROJECTION_FUNCTION(_)
+#endif
 
 #define FOR_EACH_EXTENSION_FUNCTION(_)                     \
     FOR_EACH_WIN32_EXTENSION_FUNCTION(_)                   \
@@ -133,15 +130,21 @@
     FOR_EACH_PERCEPTION_ANCHOR_INTEROP_FUNCTION(_)         \
     FOR_EACH_SCENE_UNDERSTANDING_FUNCTION(_)               \
     FOR_EACH_SCENE_UNDERSTANDING_SERIALIZATION_FUNCTION(_) \
-    FOR_EACH_SPATIAL_ANCHOR_EXPORT_FUNCTION(_)             \
     FOR_EACH_SPATIAL_ANCHOR_PERSISTENCE_FUNCTION(_)        \
     FOR_EACH_COMPOSITION_LAYER_REPROJECTION_FUNCTION(_)
 
-
 #define GET_INSTANCE_PROC_ADDRESS(name) \
     (void)xrGetInstanceProcAddr(instance, #name, reinterpret_cast<PFN_xrVoidFunction*>(const_cast<PFN_##name*>(&name)));
 #define DEFINE_PROC_MEMBER(name) PFN_##name name{nullptr};
 
+// Define a local variable of given function name and get proc address from given instance handle.
+// The returned function pointer may be nullptr when the function is not supported by the xr instance.
+// NOTE: The app should cache the function pointer for the lifetime of the corresponding instance handle,
+//       because this xrGetInstanceProcAddr operation may be expensive to do repeatedly in a frame loop.
+#define DEFINE_XR_FUNCTION_AND_GET_INSTANCE_PROC_ADDRESS(xrFunctionName, instance, PFN_xrGetInstanceProcAddr) \
+    PFN_##xrFunctionName xrFunctionName = nullptr;                                                            \
+    (void)(*PFN_xrGetInstanceProcAddr)(instance, #xrFunctionName, (PFN_xrVoidFunction*)&xrFunctionName);
+
 namespace xr {
     struct ExtensionDispatchTable {
         FOR_EACH_EXTENSION_FUNCTION(DEFINE_PROC_MEMBER);
@@ -156,4 +159,3 @@ namespace xr {
 #undef DEFINE_PROC_MEMBER
 #undef GET_INSTANCE_PROC_ADDRESS
 #undef FOR_EACH_EXTENSION_FUNCTION
-
diff --git a/shared/XrUtility/XrGuid.h b/shared/XrUtility/XrGuid.h
index 3e9dab0..2a1df0a 100644
--- a/shared/XrUtility/XrGuid.h
+++ b/shared/XrUtility/XrGuid.h
@@ -3,18 +3,57 @@
 
 #pragma once
 
-#include <memory.h>
 #include <functional>
 #include <string.h>
 
 namespace xr {
-    template <typename GUID1, typename GUID2>
-    void CopyGuid(GUID1& dest, const GUID2& src) noexcept {
-        static_assert(sizeof(GUID1) == sizeof(GUID2), "GUID sizes must be equal");
-#ifdef _MSC_VER
-        memcpy_s(&dest, sizeof(GUID1), &src, sizeof(GUID2));
-#else
-        memcpy(&dest, &src, sizeof(GUID2));
-#endif
+
+// GUID_DEFINED is defined in guiddef.h
+#ifdef GUID_DEFINED
+
+    inline constexpr GUID ToGuid(const XrUuidMSFT& src) noexcept {
+        GUID dest{};
+        const auto& u = src.bytes;
+        // Data1, Data2, and Data3 are encoded as big-endian for Variant-1
+        dest.Data1 = u[0] * 0x01000000u + u[1] * 0x00010000u + u[2] * 0x00000100u + u[3];
+        dest.Data2 = uint16_t(u[4] * 0x0100u + u[5]);
+        dest.Data3 = uint16_t(u[6] * 0x0100u + u[7]);
+        dest.Data4[0] = u[8];
+        dest.Data4[1] = u[9];
+        dest.Data4[2] = u[10];
+        dest.Data4[3] = u[11];
+        dest.Data4[4] = u[12];
+        dest.Data4[5] = u[13];
+        dest.Data4[6] = u[14];
+        dest.Data4[7] = u[15];
+        return dest;
     }
+
+    inline constexpr XrUuidMSFT ToXrUuidMSFT(const GUID& src) noexcept {
+        XrUuidMSFT dest{};
+        auto& u = dest.bytes;
+        // Data1, Data2, and Data3 are encoded as big-endian for Variant-1
+        u[0] = uint8_t(src.Data1 >> 24);
+        u[1] = uint8_t(src.Data1 >> 16);
+        u[2] = uint8_t(src.Data1 >> 8);
+        u[3] = uint8_t(src.Data1);
+
+        u[4] = uint8_t(src.Data2 >> 8);
+        u[5] = uint8_t(src.Data2);
+
+        u[6] = uint8_t(src.Data3 >> 8);
+        u[7] = uint8_t(src.Data3);
+
+        u[8] = src.Data4[0];
+        u[9] = src.Data4[1];
+        u[10] = src.Data4[2];
+        u[11] = src.Data4[3];
+        u[12] = src.Data4[4];
+        u[13] = src.Data4[5];
+        u[14] = src.Data4[6];
+        u[15] = src.Data4[7];
+        return dest;
+    }
+
+#endif // GUID_DEFINED
 } // namespace xr
diff --git a/shared/XrUtility/XrHandle.h b/shared/XrUtility/XrHandle.h
index b65a214..b75da36 100644
--- a/shared/XrUtility/XrHandle.h
+++ b/shared/XrUtility/XrHandle.h
@@ -34,7 +34,15 @@ namespace xr {
             return *this;
         }
 
-        operator bool() const noexcept {
+        bool operator==(const UniqueExtHandle& other) noexcept {
+            return m_handle == other.m_handle;
+        }
+
+        bool operator!=(const UniqueExtHandle& other) noexcept {
+            return m_handle != other.m_handle;
+        }
+
+        explicit operator bool() const noexcept {
             return m_handle != XR_NULL_HANDLE;
         }
 
diff --git a/shared/XrUtility/XrInstanceContext.h b/shared/XrUtility/XrInstanceContext.h
deleted file mode 100644
index 1fa87ef..0000000
--- a/shared/XrUtility/XrInstanceContext.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-
-#pragma once
-
-#include "XrHandle.h"
-#include "XrStruct.h"
-#include "XrString.h"
-
-namespace xr {
-    struct InstanceContext {
-        const XrInstance Handle;
-        const NameVersion AppInfo;
-        const NameVersion EngineInfo;
-        const XrInstanceProperties Properties{XR_TYPE_INSTANCE_PROPERTIES};
-        const XrPath LeftHandPath;
-        const XrPath RightHandPath;
-
-    public:
-        InstanceContext(xr::InstanceHandle instance, NameVersion appInfo, NameVersion engineInfo, XrInstanceProperties instanceProperties)
-            : Handle(instance.Get())
-            , AppInfo(std::move(appInfo))
-            , EngineInfo(std::move(engineInfo))
-            , Properties(std::move(instanceProperties))
-            , m_instance(std::move(instance))
-            , LeftHandPath(xr::StringToPath(Handle, "/user/hand/left"))
-            , RightHandPath(xr::StringToPath(Handle, "/user/hand/right")) {
-        }
-
-    private:
-        xr::InstanceHandle m_instance;
-    };
-
-    inline InstanceContext CreateInstanceContext(NameVersion appInfo, NameVersion engineInfo, const std::vector<const char*>& extensions) {
-        XrInstanceCreateInfo instanceCreateInfo{XR_TYPE_INSTANCE_CREATE_INFO};
-        xr::SetEnabledExtensions(instanceCreateInfo, extensions);
-        xr::SetApplicationInfo(instanceCreateInfo.applicationInfo, appInfo, engineInfo);
-
-        xr::InstanceHandle instance;
-        CHECK_XRCMD(xrCreateInstance(&instanceCreateInfo, instance.Put()));
-
-        XrInstanceProperties instanceProperties{XR_TYPE_INSTANCE_PROPERTIES};
-        CHECK_XRCMD(xrGetInstanceProperties(instance.Get(), &instanceProperties));
-
-        return xr::InstanceContext(std::move(instance), std::move(appInfo), std::move(engineInfo), std::move(instanceProperties));
-    }
-
-} // namespace xr
diff --git a/shared/XrUtility/XrMath.h b/shared/XrUtility/XrMath.h
index 3886949..abf1f00 100644
--- a/shared/XrUtility/XrMath.h
+++ b/shared/XrUtility/XrMath.h
@@ -459,24 +459,22 @@ namespace xr::math {
         return a / std::sqrt(Dot(a, a));
     }
 
-    inline bool IsValidFov(const XrFovf& fov) {
-        if (fov.angleRight >= DirectX::XM_PIDIV2 || fov.angleLeft <= -DirectX::XM_PIDIV2) {
-            return false;
-        }
-
-        if (fov.angleUp >= DirectX::XM_PIDIV2 || fov.angleDown <= -DirectX::XM_PIDIV2) {
-            return false;
-        }
-
-        return true;
-    }
-
     // 2 * n / (r - l)    0                  0                    0
     // 0                  2 * n / (t - b)    0                    0
     // (r + l) / (r - l)  (t + b) / (t - b)  f / (n - f)         -1
     // 0                  0                  n*f / (n - f)        0
     inline DirectX::XMMATRIX ComposeProjectionMatrix(const XrFovf& fov, const NearFar& nearFar) {
-        if (!IsValidFov(fov)) {
+        const auto ValidateFovAngle = [](float angle) {
+            if (angle >= DirectX::XM_PIDIV2 || angle <= -DirectX::XM_PIDIV2) {
+                throw std::runtime_error("Invalid projection specification");
+            }
+        };
+        ValidateFovAngle(fov.angleLeft);
+        ValidateFovAngle(fov.angleRight);
+        ValidateFovAngle(fov.angleUp);
+        ValidateFovAngle(fov.angleDown);
+        if (fabs(fov.angleLeft - fov.angleRight) < std::numeric_limits<float>::epsilon() ||
+            fabs(fov.angleUp - fov.angleDown) < std::numeric_limits<float>::epsilon()) {
             throw std::runtime_error("Invalid projection specification");
         }
 
diff --git a/shared/XrUtility/XrSessionContext.h b/shared/XrUtility/XrSessionContext.h
deleted file mode 100644
index 342e5eb..0000000
--- a/shared/XrUtility/XrSessionContext.h
+++ /dev/null
@@ -1,73 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-
-#pragma once
-
-#include "XrEnumerate.h"
-#include "XrSystemContext.h"
-#include "XrViewConfiguration.h"
-
-namespace xr {
-    struct SessionContext {
-        const XrSession Handle;
-        const XrViewConfigurationType PrimaryViewConfigurationType;
-        const XrEnvironmentBlendMode PrimaryViewConfigurationBlendMode;
-        std::vector<XrViewConfigurationType> EnabledSecondaryViewConfigurationTypes;
-
-        std::vector<DXGI_FORMAT> SupportedColorSwapchainFormats;
-        std::vector<DXGI_FORMAT> SupportedDepthSwapchainFormats;
-
-        // note: all runtimes must support VIEW and LOCAL reference spaces.
-        std::vector<XrReferenceSpaceType> SupportedReferenceSpaces;
-        bool SupportsStageSpace;
-        bool SupportsUnboundedSpace;
-
-        explicit SessionContext(xr::SessionHandle sessionHandle,
-                                const xr::SystemContext& system,
-                                const xr::ExtensionContext& extensions,
-                                XrViewConfigurationType primaryViewConfigurationType,
-                                const std::vector<XrViewConfigurationType>& appEnabledSecondaryViewConfigurationTypes,
-                                const std::vector<DXGI_FORMAT>& appSupportedColorSwapchainFormats,
-                                const std::vector<DXGI_FORMAT>& appSupportedDepthSwapchainFormats)
-            : Handle(sessionHandle.Get())
-            , m_session(std::move(sessionHandle))
-            , PrimaryViewConfigurationType(primaryViewConfigurationType)
-            , PrimaryViewConfigurationBlendMode(system.ViewProperties.at(primaryViewConfigurationType).BlendMode) {
-            for (const auto secondaryViewConfigurationType : appEnabledSecondaryViewConfigurationTypes) {
-                if (!xr::Contains(system.SupportedSecondaryViewConfigurationTypes, secondaryViewConfigurationType)) {
-                    continue; // Not supported by the system
-                }
-                EnabledSecondaryViewConfigurationTypes.push_back(secondaryViewConfigurationType);
-            }
-
-            for (auto systemSupportedSwapchainFormat : xr::EnumerateSwapchainFormats(Handle)) {
-                if (xr::Contains(appSupportedColorSwapchainFormats, systemSupportedSwapchainFormat)) {
-                    SupportedColorSwapchainFormats.push_back(static_cast<DXGI_FORMAT>(systemSupportedSwapchainFormat));
-                }
-                if (xr::Contains(appSupportedDepthSwapchainFormats, systemSupportedSwapchainFormat)) {
-                    SupportedDepthSwapchainFormats.push_back(static_cast<DXGI_FORMAT>(systemSupportedSwapchainFormat));
-                }
-            }
-
-            SupportedReferenceSpaces = xr::EnumerateReferenceSpaceTypes(Handle);
-            assert(xr::Contains(SupportedReferenceSpaces, XR_REFERENCE_SPACE_TYPE_VIEW));
-            assert(xr::Contains(SupportedReferenceSpaces, XR_REFERENCE_SPACE_TYPE_LOCAL));
-            SupportsStageSpace = xr::Contains(SupportedReferenceSpaces, XR_REFERENCE_SPACE_TYPE_STAGE);
-            SupportsUnboundedSpace =
-                extensions.SupportsUnboundedSpace && xr::Contains(SupportedReferenceSpaces, XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT);
-        }
-
-    private:
-        xr::SessionHandle m_session;
-    };
-
-    inline std::vector<XrViewConfigurationType> GetAllViewConfigurationTypes(const SessionContext& sessionContext) {
-        std::vector<XrViewConfigurationType> result;
-        result.push_back(sessionContext.PrimaryViewConfigurationType);
-        result.insert(result.end(),
-                      sessionContext.EnabledSecondaryViewConfigurationTypes.begin(),
-                      sessionContext.EnabledSecondaryViewConfigurationTypes.end());
-        return result;
-    }
-
-} // namespace xr
diff --git a/shared/XrUtility/XrSpatialGraphBridge.h b/shared/XrUtility/XrSpatialGraphBridge.h
new file mode 100644
index 0000000..0e52a3b
--- /dev/null
+++ b/shared/XrUtility/XrSpatialGraphBridge.h
@@ -0,0 +1,69 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#pragma once
+
+#include <array>
+#include <optional>
+#include "XrStruct.h"
+#include "XrHandle.h"
+#include "XrGuid.h"
+#include "XrExtensions.h"
+
+namespace xr {
+    class SpatialGraphStaticNodeBindingHandle : public xr::UniqueExtHandle<XrSpatialGraphStaticNodeBindingMSFT> {};
+
+// GUID_DEFINED is defined in guiddef.h
+#ifdef GUID_DEFINED
+
+    struct SpatialGraphStaticNodeBindingProperties {
+        GUID nodeId;
+        XrPosef poseInNodeSpace;
+    };
+
+    inline void SetNodeId(XrSpatialGraphNodeSpaceCreateInfoMSFT& createInfo, const GUID& guid) {
+#ifdef __STDC_LIB_EXT1__
+        memcpy_s(&createInfo.nodeId, sizeof(createInfo.nodeId), &guid, sizeof(guid));
+#else
+        memcpy(&createInfo.nodeId, &guid, sizeof(guid));
+#endif
+    }
+
+    inline const GUID& GetNodeIdAsGuid(const XrSpatialGraphStaticNodeBindingPropertiesMSFT& properties) {
+        return reinterpret_cast<GUID const&>(properties.nodeId);
+    }
+
+    inline xr::SpaceHandle CreateSpatialGraphNodeSpace(const xr::ExtensionDispatchTable& extensions,
+                                                       XrSession session,
+                                                       XrSpatialGraphNodeTypeMSFT nodeType,
+                                                       const GUID& nodeId,
+                                                       const XrPosef& pose) {
+        XrSpatialGraphNodeSpaceCreateInfoMSFT spaceCreateInfo{XR_TYPE_SPATIAL_GRAPH_NODE_SPACE_CREATE_INFO_MSFT};
+        spaceCreateInfo.nodeType = nodeType;
+        spaceCreateInfo.pose = pose;
+        SetNodeId(spaceCreateInfo, nodeId);
+        xr::SpaceHandle space;
+        CHECK_XRCMD(extensions.xrCreateSpatialGraphNodeSpaceMSFT(session, &spaceCreateInfo, space.Put()));
+        return space;
+    }
+
+    inline xr::SpatialGraphStaticNodeBindingHandle TryCreateSpatialGraphStaticNodeBinding(
+        const xr::ExtensionDispatchTable& extensions, XrSession session, XrSpace space, XrPosef poseInSpace, XrTime time) {
+        xr::SpatialGraphStaticNodeBindingHandle nodeBinding;
+        XrSpatialGraphStaticNodeBindingCreateInfoMSFT createInfo{XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_CREATE_INFO_MSFT};
+        createInfo.space = space;
+        createInfo.poseInSpace = poseInSpace;
+        createInfo.time = time;
+        CHECK_XRCMD(extensions.xrTryCreateSpatialGraphStaticNodeBindingMSFT(
+            session, &createInfo, nodeBinding.Put(extensions.xrDestroySpatialGraphStaticNodeBindingMSFT)));
+        return nodeBinding;
+    }
+
+    inline SpatialGraphStaticNodeBindingProperties GetSpatialGraphStaticNodeBindingProperties(
+        const xr::ExtensionDispatchTable& extensions, XrSpatialGraphStaticNodeBindingMSFT nodeBinding) {
+        XrSpatialGraphStaticNodeBindingPropertiesMSFT properties{XR_TYPE_SPATIAL_GRAPH_STATIC_NODE_BINDING_PROPERTIES_MSFT};
+        CHECK_XRCMD(extensions.xrGetSpatialGraphStaticNodeBindingPropertiesMSFT(nodeBinding, nullptr, &properties));
+        return {GetNodeIdAsGuid(properties), properties.poseInNodeSpace};
+    }
+#endif // GUID_DEFINED
+} // namespace xr
diff --git a/shared/XrUtility/XrString.h b/shared/XrUtility/XrString.h
index 3956a67..65ed85e 100644
--- a/shared/XrUtility/XrString.h
+++ b/shared/XrUtility/XrString.h
@@ -48,7 +48,7 @@ namespace xr {
         std::wstring wideText;
         const int wideLength = ::MultiByteToWideChar(CP_UTF8, 0, utf8Text.data(), (int)utf8Text.size(), nullptr, 0);
         if (wideLength == 0) {
-            DEBUG_PRINT("utf8_to_wide get size error: {}", ::GetLastError());
+            DEBUG_PRINT("utf8_to_wide get size error.");
             return {};
         }
 
@@ -56,7 +56,7 @@ namespace xr {
         wideText.resize(wideLength, 0);
         const int length = ::MultiByteToWideChar(CP_UTF8, 0, utf8Text.data(), (int)utf8Text.size(), wideText.data(), wideLength);
         if (length != wideLength) {
-            DEBUG_PRINT("utf8_to_wide convert string error:  {}", ::GetLastError());
+            DEBUG_PRINT("utf8_to_wide convert string error.");
             return {};
         }
 
@@ -71,7 +71,7 @@ namespace xr {
         std::string narrowText;
         int narrowLength = ::WideCharToMultiByte(CP_UTF8, 0, wideText.data(), (int)wideText.size(), nullptr, 0, nullptr, nullptr);
         if (narrowLength == 0) {
-            DEBUG_PRINT("wide_to_utf8 get size error:  {}", ::GetLastError());
+            DEBUG_PRINT("wide_to_utf8 get size error.");
             return {};
         }
 
@@ -80,7 +80,7 @@ namespace xr {
         const int length =
             ::WideCharToMultiByte(CP_UTF8, 0, wideText.data(), (int)wideText.size(), narrowText.data(), narrowLength, nullptr, nullptr);
         if (length != narrowLength) {
-            DEBUG_PRINT("wide_to_utf8 convert string error:  {}", ::GetLastError());
+            DEBUG_PRINT("wide_to_utf8 convert string error.");
             return {};
         }
 
diff --git a/shared/XrUtility/XrSystemContext.h b/shared/XrUtility/XrSystemContext.h
deleted file mode 100644
index a937f6c..0000000
--- a/shared/XrUtility/XrSystemContext.h
+++ /dev/null
@@ -1,80 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-
-#pragma once
-
-#include <optional>
-#include <unordered_map>
-#include "XrEnumerate.h"
-#include "XrExtensionContext.h"
-#include "XrViewConfiguration.h"
-#include "XrStruct.h"
-
-namespace xr {
-    struct SystemContext {
-        XrSystemId Id = XR_NULL_SYSTEM_ID;
-        XrFormFactor FormFactor{};
-        XrSystemProperties Properties{XR_TYPE_SYSTEM_PROPERTIES};
-        XrSystemHandTrackingPropertiesEXT HandTrackingProperties{XR_TYPE_SYSTEM_HAND_TRACKING_PROPERTIES_EXT};
-        XrSystemHandTrackingMeshPropertiesMSFT HandMeshProperties{XR_TYPE_SYSTEM_HAND_TRACKING_MESH_PROPERTIES_MSFT};
-        XrSystemEyeGazeInteractionPropertiesEXT EyeGazeInteractionProperties{XR_TYPE_SYSTEM_EYE_GAZE_INTERACTION_PROPERTIES_EXT};
-
-        std::vector<XrViewConfigurationType> SupportedPrimaryViewConfigurationTypes;
-        std::vector<XrViewConfigurationType> SupportedSecondaryViewConfigurationTypes;
-        std::unordered_map<XrViewConfigurationType, xr::ViewProperties> ViewProperties;
-    };
-
-    inline std::optional<xr::SystemContext>
-    CreateSystemContext(XrInstance instance,
-                        const xr::ExtensionContext& extensions,
-                        XrFormFactor formFactor,
-                        const std::vector<XrViewConfigurationType>& appSupportedViewConfigurationTypes,
-                        const std::vector<XrEnvironmentBlendMode>& appSupportedEnvironmentBlendMode) {
-        xr::SystemContext system{};
-        XrSystemGetInfo systemInfo{XR_TYPE_SYSTEM_GET_INFO};
-        systemInfo.formFactor = formFactor;
-        XrResult result = xrGetSystem(instance, &systemInfo, &system.Id);
-        if (result == XR_ERROR_FORM_FACTOR_UNAVAILABLE) {
-            return std::nullopt; // Cannot find a system with given form factor
-        } else {
-            CHECK_XRCMD(result);
-        }
-
-        system.FormFactor = formFactor;
-
-        // Initialize system properties including extension system properties.
-        if (extensions.SupportsHandJointTracking) {
-            xr::InsertExtensionStruct(system.Properties, system.HandTrackingProperties);
-        }
-        if (extensions.SupportsHandMeshTracking) {
-            xr::InsertExtensionStruct(system.Properties, system.HandMeshProperties);
-        }
-        if (extensions.SupportsEyeGazeInteraction) {
-            xr::InsertExtensionStruct(system.Properties, system.EyeGazeInteractionProperties);
-        }
-        CHECK_XRCMD(xrGetSystemProperties(instance, system.Id, &system.Properties));
-
-        // Initialize view configuration properties and environment blend modes
-        const std::vector<XrViewConfigurationType> systemSupportedViewConfigurationTypes =
-            xr::EnumerateViewConfigurations(instance, system.Id);
-
-        for (const auto viewConfigType : appSupportedViewConfigurationTypes) {
-            if (!xr::Contains(systemSupportedViewConfigurationTypes, viewConfigType)) {
-                continue; // The system doesn't support this view configuration
-            }
-
-            auto viewProperties = xr::CreateViewProperties(instance, system.Id, viewConfigType, appSupportedEnvironmentBlendMode);
-            if (viewProperties.SupportedBlendModes.size() > 0) {
-                system.ViewProperties.emplace(viewConfigType, viewProperties);
-
-                if (xr::IsPrimaryViewConfigurationType(viewConfigType)) {
-                    system.SupportedPrimaryViewConfigurationTypes.push_back(viewConfigType);
-                } else {
-                    system.SupportedSecondaryViewConfigurationTypes.push_back(viewConfigType);
-                }
-            }
-        }
-
-        return system;
-    }
-} // namespace xr
diff --git a/shared/XrUtility/XrToString.h b/shared/XrUtility/XrToString.h
index 4e0eb3c..3b6bb08 100644
--- a/shared/XrUtility/XrToString.h
+++ b/shared/XrUtility/XrToString.h
@@ -52,5 +52,6 @@ namespace xr {
     MAKE_TO_STRING_FUNCS(XrVisibilityMaskTypeKHR);
     MAKE_TO_STRING_FUNCS(XrReprojectionModeMSFT);
     MAKE_TO_STRING_FUNCS(XrSceneComponentTypeMSFT);
+    MAKE_TO_STRING_FUNCS(XrSceneComputeFeatureMSFT);
+    MAKE_TO_STRING_FUNCS(XrSpatialGraphNodeTypeMSFT);
 } // namespace xr
-
diff --git a/shared/XrUtility/XrUuid.h b/shared/XrUtility/XrUuid.h
index 5f7eeb4..bb4a65f 100644
--- a/shared/XrUtility/XrUuid.h
+++ b/shared/XrUtility/XrUuid.h
@@ -14,9 +14,25 @@ inline bool operator!=(const XrUuidMSFT& lh, const XrUuidMSFT& rh) noexcept {
     return !(lh == rh);
 }
 
+inline bool operator<(const XrUuidMSFT& lh, const XrUuidMSFT& rh) noexcept {
+    return memcmp(&lh, &rh, sizeof(XrUuidMSFT)) < 0;
+}
+
 namespace xr {
     // Type safe UUID for ensuring that two different types of UUIDs do not get mixed.
-    // Example: Mesh::Id and Plane::Id.
+    // Example:
+    //      XrUuidMSFT uuid {};
+    //      TypedUuid<Plane> planeId(uuid);     // allowed
+    //      TypedUuid<Mesh> meshId{planeId};    // compile error
+    //      meshId = planeId;   // compile error
+    //      meshId = uuid;      // allowed
+    //      uuid = meshId;      // compiler error
+    //      uuid = static_cast<XrUuidMSFT>(meshId);     // allowed
+    //      if (meshId < meshId_2) {}       // allowed
+    //      if (meshId != planeId) {}       // compiler error
+    //  To access the uint8_t[16] array in TypedUuid, use
+    //      static_cast<XrUuidMSFT>(meshId).bytes
+    //
     template <typename Type>
     struct TypedUuid {
         TypedUuid() noexcept = default;
@@ -41,9 +57,14 @@ namespace xr {
             return m_uuid != other.m_uuid;
         }
 
+        bool operator<(const TypedUuid& other) const noexcept {
+            return m_uuid < other.m_uuid;
+        }
+
     private:
         XrUuidMSFT m_uuid;
     };
+
 } // namespace xr
 
 namespace std {
diff --git a/shared/XrUtility/XrViewConfiguration.h b/shared/XrUtility/XrViewConfiguration.h
deleted file mode 100644
index f32da1a..0000000
--- a/shared/XrUtility/XrViewConfiguration.h
+++ /dev/null
@@ -1,67 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-
-#pragma once
-
-namespace xr {
-    // The properties of a view configuration that's immutable for a system
-    struct ViewProperties {
-        XrViewConfigurationType Type;
-        XrBool32 FovMutable;
-        XrEnvironmentBlendMode BlendMode;
-        std::vector<XrEnvironmentBlendMode> SupportedBlendModes;
-    };
-
-    // The state of a view configuration that's changing during a session but immutable for a frame
-    struct ViewConfigurationState {
-        XrViewConfigurationType Type;
-        std::vector<XrViewConfigurationView> ViewConfigViews;
-        std::vector<XrView> Views;
-        bool Active;
-    };
-
-    constexpr bool IsPrimaryViewConfigurationType(XrViewConfigurationType type) {
-        return type == XR_VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO || type == XR_VIEW_CONFIGURATION_TYPE_PRIMARY_MONO ||
-               type == XR_VIEW_CONFIGURATION_TYPE_PRIMARY_QUAD_VARJO;
-    }
-
-    inline ViewProperties CreateViewProperties(XrInstance instance,
-                                               XrSystemId systemId,
-                                               XrViewConfigurationType viewConfigurationType,
-                                               const std::vector<XrEnvironmentBlendMode>& appSupportedEnvironmentBlendModes) {
-        XrViewConfigurationProperties viewConfigProperties{XR_TYPE_VIEW_CONFIGURATION_PROPERTIES};
-        CHECK_XRCMD(xrGetViewConfigurationProperties(instance, systemId, viewConfigurationType, &viewConfigProperties));
-
-        ViewProperties properties{};
-        properties.Type = viewConfigurationType;
-        properties.FovMutable = viewConfigProperties.fovMutable;
-        properties.SupportedBlendModes = xr::EnumerateEnvironmentBlendModes(instance, systemId, viewConfigurationType);
-        properties.BlendMode = xr::PickEnvironmentBlendMode(properties.SupportedBlendModes, appSupportedEnvironmentBlendModes);
-
-        return properties;
-    }
-
-    inline ViewConfigurationState CreateViewConfigurationState(XrViewConfigurationType viewConfigurationType,
-                                                               XrInstance instance,
-                                                               XrSystemId systemId) {
-        ViewConfigurationState state{};
-        state.Type = viewConfigurationType;
-        state.ViewConfigViews = xr::EnumerateViewConfigurationViews(instance, systemId, viewConfigurationType);
-        state.Views.resize(state.ViewConfigViews.size(), {XR_TYPE_VIEW});
-
-        return state;
-    }
-
-    inline bool IsRecommendedSwapchainSizeChanged(const std::vector<XrViewConfigurationView>& oldConfigs,
-                                                  const std::vector<XrViewConfigurationView>& newConfigs) {
-        assert(oldConfigs.size() == newConfigs.size());
-        size_t end = (std::min)(oldConfigs.size(), newConfigs.size());
-        for (size_t i = 0; i < end; i++) {
-            if ((oldConfigs[i].recommendedImageRectWidth != newConfigs[i].recommendedImageRectWidth) ||
-                (oldConfigs[i].recommendedImageRectHeight != newConfigs[i].recommendedImageRectHeight)) {
-                return true;
-            }
-        }
-        return false;
-    }
-} // namespace xr