While we are passing these nuances around, is there a similar short phrase
that conveys whether the XML uses public open semantics, proprietary
semantics or ad-hoc semantics?
I've used the distinctions between "a standard XML vocabulary"
(published by committee following formal governance procedures, e.g.
W3C XHTML, OASIS DocBook, OASIS UBL), "a de facto XML vocabulary"
(something everyone can use but hasn't been formally published by a
standards-setting body, e.g. Jonathan and Tim's RDDL, my
LiterateXSLT) and "a colloquial XML vocabulary" (something thrown
together to get a job done but you wouldn't want other people to use
it or even see it, e.g. I'm not going to show you what I've had to do
sometimes).