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+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