KERML_ — Association end feature description missing simple example and equivalence to related types

Clause 7.4.5 (Associations), first two paragraphs after the references at the top describes how to declare associations and use of end features, but the

• only example of association end features is later when explaining the more advanced case of association specialization. The text references an earlier very brief description of end features in 7.3.4.2 (Feature Declaration), which points back to 7.4.5 for more information.

• third paragraph (the one starting "An association is also a relationship between the types") describes related types, but does not mention these are same as the end feature types, as specified by the deriveAssociationRelatedType constraint in 8.3.4.4.2 (Association).

Would helpful for 7.4.5 to include a simple example of association end features near the beginning where they are described, and to explain that related types are the same as end feature types.

Merge with KERML_-18

The proposed resolution to KERML_-18 rewords the first sentence of the paragraph in question, to clarify that the related types are exactly the types of the association ends.