UML23 — description of Interaction provided by the Semantic section inconsistent

The description of Interaction provided by the Semantic section sounds good by itself but is widely inconsistent with the meta-model, according Attributes sections, Association sections and Figures 14.x. For instance: the Semantic section mentions "ordered sets of occurences" that can not be found in the meta-model. It does exist an ordered property in the association between Lifeline and OccurenceSpecification but: first it's not exactly the same thing, second the related property cannot be found anywhere in the meta-classes!... My global feeling is that the chapter 14 of the meta-model is not mature, very (too much?) complex and ambiguous.

Semantics of interactions were clarified considerably.
Disposition: Closed - No Change