May 2006 - dfdl-wg - lists.ogf.org

DFDL Telcon Notes 2006-05-31
by Westhead, Martin (Martin) 31 May '06

31 May '06

Present Bob McGrath Geoff Judd Steve Hanson Mike Beckerle Discussions Scoping proposal [Mike] - simplified greatly hope to have a new version of the document by next week. Arrays document [Bob] - we discussed the arrays document modifications. Bob has added XSIL as a logical type which is very similar to the implicit internal DFDL representation. Martin wanted more details on the internal representation and was pushing for the document to present this as a possible final logical model too. UML diagrams of DFDL Parser [Geoff] - Geoff presented a pair of UML diagrams that presented a description of the operation of a DFDL parser. This is a first stage of this work and Geoff proposes to take it further and fill in some of the details.

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Date: Tue, 30 May 2006 21:41:42 -0700
by Westhead, Martin (Martin) 31 May '06

31 May '06

Conference call instructions: Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call. Web Conference: https://webconferencing.avaya.com <https://webconferencing.avaya.com/> Web Conference: Part. Code 785343; WebConf Reference 158672

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Telcon notes 2006-5-24
by Geoff Judd 24 May '06

24 May '06

Present Martin Westhead Geoff Judd 1. Conversions Had brief discussion on how the conversions work is progressing. Geoff has assigned properties to simple conversions but is trying to describe the overall algorithm using an OO class diagram that will also describe how properties relate to groups. This is only partially complete and is not ready for presentation to the group as yet but maybe be sufficiently complete by next week. Regards, Geoff Judd Websphere MQ Integrator Development IBM United Kingdom Ltd. Hursley Telephone: +44-1962-818461 E-mail: JUDDG(a)uk.ibm.com

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Telcon tomorrow
by Westhead, Martin (Martin) 24 May '06

24 May '06

Hi folks, I hope to attend tomorrow but I'm heavily committed in the morning and likely to be late, if I make it - sorry. Martin Conference call instructions: Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call. Web Conference: https://webconferencing.avaya.com <https://webconferencing.avaya.com/> Web Conference: Part. Code 785343; WebConf Reference 158672

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Telcon Notes 2006-05-17
by Westhead, Martin (Martin) 17 May '06

17 May '06

Present Martin Westhead Mike Beckerle Tom Sugden Bob McGrath Geoff Judd Steve Hanson Discussion We had no fixed agenda this week so we basically reviewed status. The following items are ongoing: * Resolving context and scope - Mike * Resolving conversions and properties - Geoff * Handling separators using conversions - Martin/all * Arrays, adding single dimension list as a logical representation - Bob

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DFDL Telcon tomorrow
by Westhead, Martin (Martin) 17 May '06

17 May '06

Conference call instructions: Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call. Web Conference: https://webconferencing.avaya.com <https://webconferencing.avaya.com/> Web Conference: Part. Code 785343; WebConf Reference 158672

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Meeting notes 2006-05-10
by Westhead, Martin (Martin) 12 May '06

12 May '06

Present Martin Westhead Bob McGrath Steve Hanson Geoff Judd Agenda Two items were discussed this week: * Document "DFDL Arrays" * Integrating conversions and properties etc. Most of the meeting was spent on the first item. Included below are Bob's notes on the discussion. The main conclusion of the discussion is that the approach seems like a very sensible direction. However it highlighted that we need to start putting in effort on pinning down a couple of the outstanding issues, context, conversions, XPath/Dpath. Steve undertook to start working on the integration of properties and convergence. Martin is going to focus on the outstanding issues with capturing our separators semantics. It was noted the Mike has been looking at bringing context and scoping together. Discussion on the document entitled "DFDL Arrays" Presents a proposed approach Comments: 1. Efficiency is an issue, particularly if there is no way for the user to know how the data is really laid out, which might lead to dramatically inefficient logical models a) this issue is not limited to DFDL b) it would be nice to have a markup to tell how the data is laid out WRT efficient access. It was argued that this is hard, and shouldn't be in the core DFDL. But if such a language exists, then it would work well with the proposed approach. 2. We hope that clever techniques a la compiler optimizations will be able to create efficient access methods. E.g., that drill through the logical layers to eliminate multiple data movements. a) want the model to make this optimization possible 3. A third logical model was suggested, which is thought to be similar to BFD. The model would be the 1D array plus a descriptor to say how to interpret it. Essentially, you may not need or want the additional XML logical model at all. a) look up BFD and correlate with that approach b) add this model to the notes 4. The Array examples highlight the need to solve two general issues: a) path expressions b) transforms, WB and BB 5. The 'occurs' is out of date, should read 'occursPath'.

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Telcon tomorrow
by Westhead, Martin (Martin) 10 May '06

10 May '06

Agenda * Array's document circulated by Bob Conference call instructions: Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call. Web Conference: https://webconferencing.avaya.com <https://webconferencing.avaya.com/> Web Conference: Part. Code 785343; WebConf Reference 158672

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Meeting notes 2006-4-19
by Westhead, Martin (Martin) 09 May '06

09 May '06

It was a very short meeting this week... Present Bob McGrath Geoff Judd Steve Hanson Martin Westhead Notes - Document expected from Bob and Mike on arrays. o Bob gave an overview of this material - Martin reported that Tom Sugden now has some time and will be working on implementing a prototype of the conversion material

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Telcon now
by Westhead, Martin (Martin) 03 May '06

03 May '06

Sorry for the late warning Conference call instructions: Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call. Web Conference: https://webconferencing.avaya.com <https://webconferencing.avaya.com/> Web Conference: Part. Code 785343; WebConf Reference 158672

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