MOF24 — MOF Figure 18

I'm confused by something in MOF Figure 18. I see that this is a "semantic domain model," and i know i'm not clear on what that means. But i feel my question makes sense absent a clear understanding of what the MOF specification means by 'semantic domain model.' This diagram is apparently the extension of "the UML 2 Instances model" mentioned at 15.1. I'll assume 'Instances model' means the Infrastructure package, Instances. And, indeed, the drawing there is (mostly) reproduced in Figure 18. My question is about the extensions shown. I'll pick one such extension to make the question concrete. The drawing shows a class, Instance, a subclass of InstanceSpecification. The Infrastructure specification is clear: an instance and an instance specification specifying that instance are not in the same model. My question: Does the term 'instance' have a different meaning in MOF than in the Infrastructure, or are the objects of the class, Instance, not instances, or what?

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