Explanation of error XMI href version mismatch
XMI allows reference to primitive types and elements using href syntax. (See the XMI spec.) In the case of
the subject XMI element, the reference appears to be to something in UML, but not in the version of UML declared for the model.
For example, the model declares to be a UML 2.5 model but this href is to something in UML 2.4.1.
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