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(normative)
The normative XMI document for UML2 Superstructure is given in Annex G. However, there are also non-normative convenience
documents that will be quite useful to tool vendors. Consider compliance level L2. XMI documents that are representations
of L2 UML2 models could be validated against the normative unmerged metamodel document which includes the packages for L2
(as well as the others). But these XMI documents have to be instances of the merged L2 metamodel and, since it is derived
from the package merge rules, there is not a normative XMI file for this. To facilitate interoperability, and to eliminate
the need for tool vendors to implement package merge in order to produce XMI metamodel documents for the UML2 compliance levels,
the XMI documents for each compliance level are included in this annex. An XMI document for a compliance level is the XMI
representation of the merged CMOF metamodel for that compliance level.
XML uses XSD to validate instances of XML documents, and the MOF 2.0/XMI Mapping Specification, v2.1 specifies how these schema
documents are derived for a given CMOF model. However, XSD cannot capture all of the structure, constraints, or semantics
of a UML2 compliance level, so vendors may choose to use MOF reflection or XMI metamodel documents to provide more complete
validation.
The following convenience specifications are related to the UML2 Superstructure and are included in document ptc/0601-04:
• L0.cmof
• LM.cmof
• L1.cmof
• L2.cmof
• L3.cmof