Naming scheme for property names/prefixes

Hallo List,

I wonder if there is already a naming scheme for property names.

Certainly we all know that the subversion native properties have a prefix
of "svn:". Prefixes of "tsvn:" for tortoise properties (?) and "bugtraq:"
for bug tracking purposes are also invented.

But what about sire internal stuff and systems under development?
"x-<something>:"? Just "<site shortname>:"?

Any conventions yet?

Best regards
     Henning Hucke

-- 
I will follow the good side right to the fire,
but not into it if I can help it.
 		-- Michel Eyquem de Montaigne