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R16
Element is a Spanning Element or Subsystem Element
A Subsystem Element (Class, Relationship) is managed entirely within a single Subsystem whereas a Spanning Element (Domain Type, Lineage, Constrained Loop) cannot be confined to a single Subsystem.
While a Relationship may cross from one Subsystem to another, by policy, the Relationship is managed by either one or the other. While a Class may be referenced in many Subsystems, it is managed in only one designated Subsystem. In both cases consider the Element to originate as a component of a specific Subsystem.
This policy does not really make sense for Types which are available anywhere in a Domain. A Constrained Loop could conceivably be managed by Subsystem, but, as with Types, it is not clear that there would be any benefit to an arbitrary Subsystem designation.
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