UCM11 — Bring more flexibility in composite component extensions

Composite component implementations can extend other composite implementations. Parts and connections can be refined, with some limitations to guarantee consistency:

• refined parts must be of the same component type
• refined connections must be of the same connector definition or an extended connector definition

This is actually too restrictive. The following should be allowed:

• refined parts should be of the same component type OR a component type that refines the initial component type
• refined connections should simply be consistent with the connected ports

bring more flexibility in composite component extensions

In component types, restrict port refinements: instead of allowing any refinement, refining ports must now reference the same port role.
In composite component implementations, allow a part to reference any refinement of the component referenced by the inherited part, instead of restricting to the same component type. Also, allow connection refinement to reference any connector definition as long as it gives a consistent architecture.