NEG — Cannot attribute an additional MemberKind to an exiting Member

Problem: Under the Community::Membership interface there are operations to add members to a membership under a specific business role. There are also operations supporting the removal of a business role of an existing member. The approach to the addition of a supplementary business roles is through the operation add_kind_of_member, however, this is ambiguous when the exclusivity policy is set to false (as the client may be adding a Member instance as a new member or adding a MemberKind to an existing Member). Propose elimination of the inconsistency by restricting the semantics of add_kind_of_member to new Member instance creation, and supplementing the Membership interface with an additional operation add_kind for attribution of MemberKind roles to an existing Member instance.

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