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DFDL: MikeB unable to make call this week
by Mike Beckerle 11 Mar '08

11 Mar '08

Sorry folks, I am on customer engagement and unable to make the call this week. .mike

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DFDL: Minutes from OGF WG call, 05 Mar 2008
by Ian W Parkinson 06 Mar '08

06 Mar '08

Open Grid Forum: Data Format Description Language Working Group Weekly Working Group Conference Call 17:00 GMT, 05 Mar 2008 Attendees Mike Beckerle (Oco) Steve Hanson (IBM) Ian Parkinson (IBM) Apologies Alan Powell (IBM), Simon Parker (PolarLake) 1. Discriminator Expressions Recent discussions on the DFDL-WG email list need to be written up for inclusion in the specification. It would be useful, as discussed, to automatically generate discriminators when converting COBOL copybooks, C structs etc. to DFDL schemas. As Mike observed, this will be difficult as copybooks and header files do not typically contain enough information to generate descriminators. 2. UML diagrams Steve is happier with the proposed UML diagrams now that they have been simplified. We had previously decided to include, in the specification, just the diagram showing the supported subset of XML schema. Now the diagrams are simplified, Simon is planning to attempt to combine the three current diagrams into a single diagram. Mike suggested a difficulty with these diagrams; some concepts (for example, element references) are not treated as real components in XML schema but are used, by DFDL, as part of the scoping rules. 3. valueCalc examples Mike has distributed a set of Powerpoint slides giving examples of calculated values, and thanks the group for the feedback. He will add an additional example showing output length calculation. 4. Remaining specification work The plan for draft 32 need to be adjusted as we have now missed many of the planned dates. Steve's 'unparser property precedence' item is complete; and the discussion on assertions and discriminators has made good progress, and need final write-up by Suman. Work on speculative parsing still needs to be assigned an owner, probably from IBM's WTX team. With regard to speculative parsing, Steve wondered whether this might affect the ability of an implementation to implement optimisations such as lazy parsing. Although this remains an implementation detail and not a subject to be covered by the DFDL specification, we will need to describe aspects of the behaviour of speculative parsing to be able to define uncertainty resolution in DFDL. Mike will include a review of the list of outstanding work items in the agenda for next week's DFDL-WG call. Meeting closed, 17:35 GMT Ian Parkinson WebSphere ESB Development Mail Point 211, Hursley Park, Hursley, Winchester, SO21 2JN, UK Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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WG call this week
by Alan Powell 05 Mar '08

05 Mar '08

I will not be able to make the call this week Alan Powell MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England Notes Id: Alan Powell/UK/IBM email: alan_powell(a)uk.ibm.com Tel: +44 (0)1962 815073 Fax: +44 (0)1962 816898 Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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Apologies: cannot attend today
by Simon Parker 05 Mar '08

05 Mar '08

A critical project has prevented me from dfdl work since last week, but I hoped to attend the conference anyway. I now find that I can't even manage that, I'm afraid. The important milestone is this Friday, so I hope to resume normal participation after that. Mike's slides look good to me. It's a realistic case well presented. I add one observation to Steve's. Emphasize the details of the physical representation. In particular, point out it's only three bytes long. Consider including an example, showing bits and hex. Sorry. Simon Simon Parker Software Consultant PolarLake 80 Harcourt Street Dublin 2, Ireland Phone +353 1 449-1075 Fax +353 1 449-1011 Web http://www.polarlake.com/ The information transmitted in this email is intended for the addressee only and may contain confidential and/or privileged material. Any review, retransmission, dissemination, reliance upon or other use of this information by persons or entities other than the addressee is prohibited. If you think, for any reason, that this message may have been addressed to you in error, we would ask you to notify the sender immediately by return email and delete the material. PolarLake Limited | Registered in Dublin, Ireland | Number 357324 | Registered office as above.

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Slides about Calculated Values
by Mike Beckerle 05 Mar '08

05 Mar '08

Attached are ppt slides which contain a new worked out calculated values example. I'm curious what people think.

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Re: [DFDL-WG] DFDL Schema abstract data model 4
by Steve Hanson 27 Feb '08

27 Feb '08

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(a)uk.ibm.com Phone (+44)/(0) 1962-815848 Steve Hanson/UK/IBM 27/02/2008 16:26 To "Simon Parker" <simon.parker(a)polarlake.com> cc dfdl-wg(a)ogf.org Subject Re: [DFDL-WG] DFDL Schema abstract data model 4 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(a)uk.ibm.com Phone (+44)/(0) 1962-815848 "Simon Parker" <simon.parker(a)polarlake.com> Sent by: dfdl-wg-bounces(a)ogf.org 07/02/2008 11:54 To <dfdl-wg(a)ogf.org> cc 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 80 Harcourt Street Dublin 2, Ireland Phone +353 1 449-1075 Fax +353 1 449-1011 Web http://www.polarlake.com/ The information transmitted in this email is intended for the addressee only and may contain confidential and/or privileged material. Any review, retransmission, dissemination, reliance upon or other use of this information by persons or entities other than the addressee is prohibited. If you think, for any reason, that this message may have been addressed to you in error, we would ask you to notify the sender immediately by return email and delete the material. PolarLake Limited | Registered in Dublin, Ireland | Number 357324 | Registered office as above. -- dfdl-wg mailing list dfdl-wg(a)ogf.org http://www.ogf.org/mailman/listinfo/dfdl-wg Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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DFDL Schema abstract data model 4
by Simon Parker 27 Feb '08

27 Feb '08

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 Phone +353 1 449-1075 Fax +353 1 449-1011 Web http://www.polarlake.com/ The information transmitted in this email is intended for the addressee only and may contain confidential and/or privileged material. Any review, retransmission, dissemination, reliance upon or other use of this information by persons or entities other than the addressee is prohibited. If you think, for any reason, that this message may have been addressed to you in error, we would ask you to notify the sender immediately by return email and delete the material. PolarLake Limited | Registered in Dublin, Ireland | Number 357324 | Registered office as above.

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DFDL WG Weekly call 2008-02-27 Agenda
by Mike Beckerle 27 Feb '08

27 Feb '08

(Note: Mike Beckerle cannot attend today's call.) Notes from the missing: Summary of OGF22 presentation - There is not much to say here. There were about 15 attendees. A few questions, and people were pleased to see progress. No volunteers to implement/review/help out. Next OGF23 is Barcelona, after that OGF24 is Singapore. Those are both this year. Value Calc - example was circulated as powerpoint. Suggest review of this for next call on March 5. Agenda topics scheduled for today include: - Discussion of Simon's UML diagrams for the schema components

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DFDL: test email
by Mike Beckerle 25 Feb '08

25 Feb '08

Sorry to trouble you, but could active DFDL WG members please send an email back to me directly to mbeckerle.dfdl(a)ogf.org. Please let me know if you received an email from me yesterday which contains an attachment of slides about the Computed Values. I did not receive this mail myself from dfdl-wg(a)ogf.org, but I did see someone's vacation responder .... so I am wondering if it was delivered properly. ...mike beckerle

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AUTO: Brian Petrini is on vacation(returning 03/03/2008)
by Brian Petrini 23 Feb '08

23 Feb '08

I am out of the office until 03/03/2008.. Hello, I'm on vacation until Monday March 3. For anything urgent, please contact my manager Sam Kaipa (kaipa(a)us.ibm.com) I'll respond as soon as I can. Thanks, -Brian Note: This is an automated response to your message dfdl-wg Digest, Vol 18, Issue 13 sent on 2/23/08 13:08:26. This is the only notification you will receive while this person is away.

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