We read in 7.4:

"A non-transitional implementation conforms to this specification if it satisfies all of the MUST or REQUIRED level requirements defined above. "

Is that true? ALL the "MUST" in all previous sections? Probably not. Or maybe it is "below" and not "above". (always explicitly refer to requirements sets by using a sub-section number & name)

I suggest to make "transitional" just a variable (i.e. a parameter) in previous top-level conf clauses. (see TAB conformance guideline http://docs.oasis-open.org/templates/TCHandbook/ConformanceGuidelines.html, section 5.5) E.g. someone claiming conformance as "PCI driver" should always clarify: "transitional PCI driver" or "non-transitional PCI driver"