1) I think Ristow and Amsler are right: a specification of standard
presentational markup for TEI tags would be a good thing.
2) However, preparing such a specification will be no small matter.
I doubt if the TEI could do it without extending its schedule and
receiving increased funding.
3) A formatting specification itself requires a standard declarative
language. The problems in developing such a language are
considerable. Fortunately there is one already under development
in ISO/IEC JTC1/SC18 WG8. It is DP10179: Document Style
Semantics and Specification Language (DSSL). Can anyone
on this list comment authoritatively on DSSL?