Very quick description of what TripleDB is.

db/tripledb/README

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+This is the TripleDB, a way of persistantly remembering "triples" of data.
+
+Each entry is kind of a "subject-verb-object" set. For example, some
+entries might be:
+
+Noun            Verb            Object
+=========================================
+File1           Length          1253254
+File1           MimeType        text/html
+File1           Author          Ralph
+File2           Length          32542
+File2           MimeType        image/gif
+File2           Author          Bertha
+
+
+This API is about storing, deleting, and querying such triples to a
+database. Each member of a triple can be a string, integer, or date.
+
+For more details, read the API, in tdbapi.h.
+
+
+FAQ:
+
+Q: "Hey!  There's no Makefile!"
+A: Yeah, yeah, I know.  This is developed as part of a project at
+work, and our Makefiles are all messed up.  If you have one that fits in well
+with other stuff at mozilla.org, please feel free to contribute it.
+
+Q: Um, so else here uses this?
+A: That's right.  But this maps in pretty well to RDF, I believe.  I wouldn't
+be surprised if someone decides to use it to store a biggish RDF database,
+and adds it to mozilla for that purpose.
+
+
+
+- Terry Weissman                        terry@mozilla.org