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Issue 3899: Specify meta-model & XMI parameters for CWM XMI formats

Issue 3899: Specify meta-model & XMI parameters for CWM XMI formats (cwm-ftf)

As of XMI 1.1, an XMI format depends on both the input MOF meta-model(s)
AND some other parameters.

The CWM specification should state what XMI parameters have been used to
generate the CWM / XMI interchange formats.  In particular, it should 
specify:

  1)  what XML namespaces were used

  2)  what (if any) "domain data type metamodels" were used, and what 
they are

  3)  any custom data value <-> XML string encoding rules used, and

  4)  whether the format supports "incomplete models".

There may be some other XMI parameters that I haven't discovered yet.

Finally, the CWM spec or an appendix should include the definitive CWM
meta-model expressed as a MOF / XMI document.

Without this information, it is difficult for someone other than the
CWM submitters to instantiate CWM repositories and CWM / XMI interchange
software.