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private ldb API ldb_sqlite3 is already working with this model and ldb_tdb will do as soon as tridge finishes the tdb transaction code. currently the transactions are always implicit and wrap any single ldb API call except searching, the transaction functions are currently not made public on purpose. Simo.
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