Address review comments

csharp/ql/lib/semmle/code/csharp/dataflow/internal/ExternalFlow.qll

@@ -87,6 +87,7 @@
  */
 
 import csharp
+import ExternalFlowExtensions
 private import AccessPathSyntax
 private import DataFlowDispatch
 private import DataFlowPrivate
@@ -96,37 +97,6 @@ private import FlowSummaryImpl::Private::External
 private import FlowSummaryImplSpecific
 private import codeql.mad.ModelValidation as SharedModelVal
 
-/**
- * Holds if a source model exists for the given parameters.
- */
-extensible predicate sourceModel(
-  string namespace, string type, boolean subtypes, string name, string signature, string ext,
-  string output, string kind, string provenance
-);
-
-/**
- * Holds if a sink model exists for the given parameters.
- */
-extensible predicate sinkModel(
-  string namespace, string type, boolean subtypes, string name, string signature, string ext,
-  string input, string kind, string provenance
-);
-
-/**
- * Holds if a summary model exists for the given parameters.
- */
-extensible predicate summaryModel(
-  string namespace, string type, boolean subtypes, string name, string signature, string ext,
-  string input, string output, string kind, string provenance
-);
-
-/**
- * Holds if a neutral model exists for the given parameters.
- */
-extensible predicate neutralModel(
-  string namespace, string type, string name, string signature, string kind, string provenance
-);
-
 private predicate relevantNamespace(string namespace) {
   sourceModel(namespace, _, _, _, _, _, _, _, _) or
   sinkModel(namespace, _, _, _, _, _, _, _, _) or

csharp/ql/lib/semmle/code/csharp/dataflow/internal/ExternalFlowExtensions.qll

@@ -0,0 +1,34 @@
+/**
+ * This module provides extensible predicates for defining MaD models.
+ */
+
+/**
+ * Holds if a source model exists for the given parameters.
+ */
+extensible predicate sourceModel(
+  string namespace, string type, boolean subtypes, string name, string signature, string ext,
+  string output, string kind, string provenance
+);
+
+/**
+ * Holds if a sink model exists for the given parameters.
+ */
+extensible predicate sinkModel(
+  string namespace, string type, boolean subtypes, string name, string signature, string ext,
+  string input, string kind, string provenance
+);
+
+/**
+ * Holds if a summary model exists for the given parameters.
+ */
+extensible predicate summaryModel(
+  string namespace, string type, boolean subtypes, string name, string signature, string ext,
+  string input, string output, string kind, string provenance
+);
+
+/**
+ * Holds if a neutral model exists for the given parameters.
+ */
+extensible predicate neutralModel(
+  string namespace, string type, string name, string signature, string kind, string provenance
+);

docs/codeql/codeql-language-guides/extensible-predicates.rst

@@ -22,7 +22,7 @@ About extensible predicates
 
 At a high level, there are two main components to using data extensions. The query writer defines one or more extensible predicates in their query libraries. CLI and code scanning users who want to augment these predicates supply one or more extension files whose data gets injected into the extensible predicate during evaluation. The extension files are either stored directly in the repository where the codebase to be analyzed is hosted, or downloaded as CodeQL model packs.
 
-This example of an extensible predicate for a source is taken from the core Java libraries https://github.com/github/codeql/blob/main/java/ql/lib/semmle/code/java/dataflow/ExternalFlowExtensions.qll#L8-L11
+This example of an extensible predicate for a source is taken from the core Java libraries https://github.com/github/codeql/blob/main/java/ql/lib/semmle/code/java/dataflow/internal/ExternalFlowExtensions.qll#L8-L11
 
 .. code-block:: ql
 

go/ql/lib/semmle/go/dataflow/ExternalFlow.qll

@@ -74,7 +74,7 @@
  */
 
 private import go
-private import ExternalFlowExtensions as Extensions
+import internal.ExternalFlowExtensions
 private import internal.DataFlowPrivate
 private import internal.FlowSummaryImpl::Private::External
 private import internal.FlowSummaryImplSpecific
@@ -82,15 +82,6 @@ private import internal.AccessPathSyntax
 private import FlowSummary
 private import codeql.mad.ModelValidation as SharedModelVal
 
-/** Holds if a source model exists for the given parameters. */
-predicate sourceModel = Extensions::sourceModel/9;
-
-/** Holds if a sink model exists for the given parameters. */
-predicate sinkModel = Extensions::sinkModel/9;
-
-/** Holds if a summary model exists for the given parameters. */
-predicate summaryModel = Extensions::summaryModel/10;
-
 /** Holds if `package` have MaD framework coverage. */
 private predicate packageHasMaDCoverage(string package) {
   sourceModel(package, _, _, _, _, _, _, _, _) or

java/ql/lib/semmle/code/java/dataflow/ExternalFlow.qll

@@ -93,7 +93,7 @@ private import internal.DataFlowPrivate
 private import internal.FlowSummaryImpl::Private::External
 private import internal.FlowSummaryImplSpecific as FlowSummaryImplSpecific
 private import internal.AccessPathSyntax
-private import ExternalFlowExtensions as Extensions
+private import internal.ExternalFlowExtensions as Extensions
 private import FlowSummary
 private import codeql.mad.ModelValidation as SharedModelVal