[tei-council] List @type musings

[Syd Bauman]

I have to admit, I'm not a big fan of a suggested values include list
for @rend in the _Guidelines_. At the moment, I can't really
articulate a reason why not, though, so I can't really object.

However, I'm with James -- @type should be inherited from att.typed
unless there's a good reason not to. (Which nowadays is "don't want
@subtype", which is pretty darn rare.)