Topic Maps, trait for DBM Storage, synchronous
This package subclasses TM::Synchronizable with a MLDBM store. The methods "source_in" and
"source_out" do the obvious things of copying between the DBM file and the in-memory
representation. Only during the synchronisation the DBM file is locked. Otherwise the two copies are
independent. The synchronisation is quite performant, certainly faster than using a text
representation of the map.