SMM12 — The wording “base measure(ment)” is ambiguous.

By base measure(ment) we mean the measure(ment)s which are input to a (derived) measure(ment). But "base" is a normative word, that the meta-model uses in a much narrower scope than the spec does. This is confusing. Also: The term "derived measure" is used in quite several places in the spec, but nowhere defined.

Make the specification consistent with respect to the use of the term "base measure(ment)"

We apply several minor changes to the text, and a few to the meta-model, to ensure that the text and the meta-model of the specification are well-aligned with respect to using the terms "Base Measure" and "Base Measurement". In particular we make sure that, where-ever a derived Measure(ment) is derived from an input Measure(ment), this derivation is always achieved by a Base Measure(ment) Relationship, so that the use of the term "base" is always founded in the meta-model.