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This was removed from ldb_tdb a while ago Andrew Bartlett (This used to be commit fcb87e77860b449ac3483ccec5e6b5ed087540f2)
trees.ps contains an explanation of the Genealogical Representation of Trees in Databases which is being used in ldb_sqlite3. Note that we use fgID representation with 4 bytes per level, so we can represent 6.5E+08 subclasses of any object class. This should be adequate for our purposes. :-) The following document is the primary basis for the schema currently being used here: http://www.research.ibm.com/journal/sj/392/shi.html