XMI21 — XMI for MOF 2 defines tagged values

The XMI for MOF 2 specification defines several tagged values for adding
data to a UML model that guide generation of an XML Schema and that guide
document production. But these tags appear to be defined as if for MOF 1.
To be appropriate for MOF 2 these must be defined using either an extension
to the MOF or UML core models (as a package that adds to MOF and/or UML
infrastructure) or they must be defined as a UML 2 profile. In either case,
an official XML rendering of the model or profile is required. And given
the big change from MOF 1, an example of such tags as they would appear in
an XMI-based XML document of an example model would be very helpful.