MOF26 — CMOF constraint OCL for ownedEnd is too restrictive

The OCL is as follows. The restriction that ownedEnd->size() < 2 is not justified by the text of the constraint nor the specification, which refer only to memberEnds and size being limited to 2.
In fact associations which own both their ends are a frequently used and useful (e.g. to link 2 independnetly developed (meta)models.
The constraint should be ownedEnd->size() <= 2.

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– 14.3 [1] The multiplicity of Association::memberEnd is limited to 2 rather than 2..* (i.e., n-ary Associations are not supported);
– unlike EMOF, CMOF associations can have navigable association-owned ends.
– see also: https://sites.google.com/site/metamodelingantipatterns/catalog/mof/association-does-not-have-two-member-ends

context Association
inv CMOF_14_3_1: memberEnd->size() = 2 and ownedEnd->size() < 2

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