[DFDL-WG] DFDL Schema abstract data model 4

[Simon Parker]

Good morning.
 
As discussed yesterday, here is a fresh version with improvements and
corrections applied.
I added a note to the Discussion section, reproduced here for
convenience.
 
---
Yesterday's conference expressed the view that the version 3 model
contained more detail than was useful. Version 4  removes some of the
new abstractions to bring it closer to version 2, but retains most of
the relationships.
The new naming conventions (Global*, *Reference, *Definition) didn't
find favour, and this version uses established names for abstractions
discussed in the XML Schema specification.
Other changes correct errors and misunderstandings: only simple types
may have explicit base types; DFDL doesn't support All groups or
explicit Group constructs in groups; some associations were incorrectly
described as aggregations.
Dfdl annotations can be used at any annotation point. There are some
restrictions, but this model cannot show details clearly so they are
left for a different form of presentation or for later addition.
---
 
Regards,
 Simon 
 
Simon Parker
Software Consultant
PolarLake
80 Harcourt Street
Dublin 2, Ireland
 
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Fax    +353 1 449-1011
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