i had a brief fascinating chat with the author of PeriPeri, a testingground rdf-backed
miniwiki, earlier this evening and ran across this entertaining and possibly pertinent
page on faceted classification / unplugging hierarchies etc. maybe old news?
FWIW re Habituation, i have found distinct fields and purposes for Category and Locale to
be invaluable, but the category foo / category foo index distinction to be a bit painful
and disjointy to unaccustomed users...