[DFDL-WG] DFDL Schema abstract data model 4

[Steve Hanson]

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 at uk.ibm.com
Phone (+44)/(0) 1962-815848



"Simon Parker" <simon.parker at polarlake.com> 
Sent by: dfdl-wg-bounces at ogf.org
07/02/2008 11:54

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[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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Dublin 2, Ireland
 
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