As discussed on the OGF WG call, the
simplified diagram I propose should be in a primer, and not in the actual
specification. I'm perfectly ok with that.
Regards, Steve
Steve Hanson
WebSphere Message Brokers
Hursley, UK
Internet: smh@uk.ibm.com
Phone (+44)/(0) 1962-815848
| Steve Hanson/UK/IBM
27/02/2008 16:26
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To
| "Simon Parker" <simon.parker@polarlake.com>
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cc
| dfdl-wg@ogf.org
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Subject
| Re: [DFDL-WG] DFDL Schema abstract data
model 4Link |
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Hi Simon
That looks better.
I'd still like to see an even simpler
introductory diagram, if that is possible, which while not showing 100%
of XML Schema constructs, shows enough to give the user a good idea of
the key schema objects involved. The existing diagram in draft 31 section
5, but with the 'dimension' box removed, is very attractive to first time
users. It introduces elements which can be of simple type or complex type,
the latter consisting of a group being either sequence or choice, which
contains a sequence of elements or wildcards. Note no mention of particles
at this point.
It may not be possible to accomodate
such a simple diagram with the full diagram without contradictory terminology?
But I think we should try.
FWIW I use a very similar diagram to
explain the IBM MRM model to first-time users.
Regards, Steve
Steve Hanson
WebSphere Message Brokers
Hursley, UK
Internet: smh@uk.ibm.com
Phone (+44)/(0) 1962-815848
"Simon Parker"
<simon.parker@polarlake.com>
Sent by: dfdl-wg-bounces@ogf.org
07/02/2008 11:54
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To
| <dfdl-wg@ogf.org>
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cc
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Subject
| [DFDL-WG] DFDL Schema abstract data
model 4 |
|
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
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IBM United Kingdom Limited - Registered in England and Wales with number
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Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
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