Platform-Independent Model for WS-Calendar uploaded (D8)

We've discussed this project for quite a while. The  Platform  in
this case are the details of parameters, valuetypes, and the
structure of xcal.
The goal was to create a more abstract model related to the less
abstract model, to make the ws-calendar extensions and their
relationships more clear. This may be useful in extending the reach
of the intervals and gluons of WS-Calendar to new areas, while
clarifying their relationships.
I've uploaded an Enterprise Architect EAP file and a jpg of the
class diagrams; comments welcome.
We've used the approach of a single abstract PayloadType class for
the attachments mechanism, as this works well in many other
environments (and avoids the dreaded  any  in XSD).
Known issues:
Vavailability is overly simplified
Streams are pretty close to a PIM themselves.
Thanks!
bill

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William Cox
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