samba-mirror/source/lib/ldb/ldb_sqlite3

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. :-)