[Comment 9] : Section 5 Conformance: The rationale of "one or more extension modules" (at the user's choice) in point #2 of conformance clause is hard to understand.
Sounds like a quantitative requirements to fulfill about a number of discrete functional capabilities that have nothing to do with each other
(how will that help me assess the level of ICOM compatibility of an implementation, or its functional scope if the implementation implements a different module compared to mine or to another?)
In that case why not define 2 levels of conformance: Core conformance level, then Extended conformance level (which involves 1 or more ext Modules).