Use of "level" or "version" parameter to denote use of experimental features?

Larry Masinter (
Mon, 16 Jan 95 17:29:05 EST

I've been wondering if we might allow some way to designate with the
"level" or "version" parameter (or some other parameter) for
describing a document that is mainly 'text/html' but also contains
experimental features. E.g.,

text/html; level=x-w3org-3

This would allow folks to experiment with minor increments for which
saying "text/html; level=3" would be wrong.

Do you like the idea? If so, should it be "level", "version", or some
other parameter?