We should discuss this on today's call...
Regards, Steve
Steve Hanson
WebSphere Message Brokers
Hursley, UK
Internet: smh@uk.ibm.com
Phone (+44)/(0) 1962-815848
Alan Powell/UK/IBM@IBMGB
Sent by: dfdl-wg-bounces@ogf.org
25/10/2007 15:21
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To
| Mike Beckerle <beckerle@us.ibm.com>
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cc
| dfdl-wg@ogf.org
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Subject
| Re: [DFDL-WG] Material for Call on 2007-10-24 |
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Mike
I have been reviewing ch 6 Sequence Groups,
Initiators and Separators of
proposal-to-simplify-null-default-optional-handling-v4.doc and I
am uneasy about the approach of transforming the DFDL. This is because
1. They
are examples rather than rules so do not fully explain the syntax.
2. The
results are often so convoluted that they do not, at least to me, provide
any clarification. So much so that I believe most of the examples
are actually wrong.
I think that we should either provide proper transformation rules or just
stick to explaining original DFDL syntax.
Comments added to Ch 6 examples.
Alan Powell
MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com
Tel: +44 (0)1962 815073
Fax: +44 (0)1962 816898
Mike Beckerle <beckerle@us.ibm.com>
Sent by: dfdl-wg-bounces@ogf.org
23/10/2007 23:03
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To
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cc
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Subject
| [DFDL-WG] Material for Call on 2007-10-24 |
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We had been reviewing the facets and default/null/optional a few weeks
back.
I said I would make revisions as a number of people had objections.
Here are documents based on these comments.
Main things I did: (1) strict adherence to minOccurs and maxOccurs. No
more notion that these are only for validity checking.
(2) simple rule for default values: if it's required and there's a default
value, then use the default value. This is for both input and output.
I put a bunch of work into illustrating the semantics of things like dfdl:separatorPolicy="suppress"
and so forth. I had been trying to simplify this, but gave up. We're back
to 3 policies here: keep, suppress, suppressAtEnd. I did figure out a way
to express these via DFDL rewriting.
...mikeb
Mike Beckerle
STSM, Architect, Scalable Computing
IBM Software Group
Information Platform and Solutions
Westborough, MA 01581
direct: voice and FAX 508-599-7148
assistant: Pam Riordan
priordan@us.ibm.com
508-599-7046
[attachment "proposal-on-facets.doc" deleted by Alan Powell/UK/IBM]
[attachment "proposal-to-simplify-null-default-optional-handling-v4.doc"
deleted by Alan Powell/UK/IBM] --
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