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Telcon Notes 2006-07-19
by Westhead, Martin (Martin) 19 Jul '06

19 Jul '06

Present Geoff Judd Mike Beckerle Steve Hanson Suman Bob McGrath Status on combined doc * Revision 5 has all material except variables proposal in * Size of document is a problem - 150 pages and still with blank sections. Plans for OGF in DC * We are aiming to have a draft document ready for submission/presentation to the GGF audience. * It is not clear that we can get a quorum for a face-to-face at the same time so it may make sense to separate the two. * It was suggested that we might be able to make more of teleconference/video-conference facilities, have longer calls and specific tasks particularly as we come to work more directly on a document. * Conclusion - we will seek in-principle approval for a F2F but hold off on planning a date. Status of separators * This is the task of trying to find an elegant way to express the general problem of determining the length of a structure within the data. Martin is looking at ways to capture this but does not yet have a solution that handles all the difficult cases. Tech discussion topics * We had a discussion on the inclusion of attributes. The proposal was that attributes should not be included for direct population but a specific proposal to allow their inclusion in the data model using references should be considered. * DFDL Lite - at the tail end of the meeting after some people had dropped we started considering a different approach to the problem of trimming down the scope - rather than looking for tricky things we could cut off could we look at the simplest DFDL that does something useful and build it so that it can be grown. I will send out a separate email on this topic.

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DFDL Telcon today
by Westhead, Martin (Martin) 19 Jul '06

19 Jul '06

Time: 9am PDT Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call.

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Prototyping Progress
by Tom Sugden 14 Jul '06

14 Jul '06

Hi all, I've been reading draft DFDL spec and scoping doc, and playing around a little with a prototype implementation of an event-based DFDL processor. Unfortunately my time has been limited because the effort has not been scheduled here at EPCC. The general idea is to first generate an internal representation of a DFDL schema. This object model should be easier to work with than a DOM Document and will provide access to the context within scope for each element of the object model, including the supported conversions. For a read scenario, an instance of this object model can be traversed while the underlying data stream is processed into a sequence of DFDL events. At the moment the proto-type supports the example given in section 12.2 of the scoping document. A push-parse is currently implemented, though a pull-parse should also be possible. I'm sorry for regularly missing the telcons. I was away for a while getting married and honeymooning, then got stuck in a meeting on Wednesday. Next week I'm teaching at the grid summer school, but I hope to resume some DFDL work the week after that. Looking forward to seeing developments in the new specification document. Cheers, Tom

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DFDL work group call 2006-07-12
by Mike Beckerle 12 Jul '06

12 Jul '06

Attended: Martin Westhead Mike Beckerle Steve Hanson Status: Mike working on consolidating wildcards/uncertainty, variables, defaults/nulls/optionals, and list of properties into the combined document. Martin sent materials on hidden elements to Mike also for incorporation. So called "missing" materials on selectors/test/guards is actually in the conversions material (will need to be refactored out given current combined doc outline) Goal: all these pieces combined in 1 to 2 weeks. Martin still working on how to express semantics of groups, targeting a write up of something in 1 to 2 weeks. Planning: General GGF meeting in Sept. 11-14, In Washington DC. We will need to present there. However, there's no reason for our GGF presentation sessions to be part of our F2F meeting. Tentative plan: Face to Face workgroup meeting on Sept 13, 14, 15 ? IBM can host at a facility, but these are in the suburbs; hence, are not near the Convention center where Grid World and GGF will be taking place. *** Question for the group: are these dates reasonable? Who would/ would not be able to attend? Our goal should be to have our combined draft document in 'reasonable shape' such that we can use the GGF meeting to invite/recruit new members. What we mean by 'reasonable shape' is not that the document will be anywhere close to final form, but more like the document will be informative and not mislead people about the direction we are heading. We'll have to make a call on whether we think we'll achieve this level with our document about a month in advance of the GGF meeting since we'll need to reach out to potential new members for our WG in advance of the GGF meeting in order to get them to attend the sessions. ...mikeb Mike Beckerle STSM, Architect, Scalable Computing IBM Software Group Information Integration Solutions Westborough, MA 01581 voice and FAX 508-599-7148 home/mobile office 508-915-4795

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Telcon now
by Westhead, Martin (Martin) 12 Jul '06

12 Jul '06

Sorry for the late reminder Time: 9am PDT Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call.

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DFDL scoping version 018
by Mike Beckerle 07 Jul '06

07 Jul '06

I incorporated comments from our WG call and updated the scoping document: https://forge.gridforum.org/sf/docman/do/viewDocument/projects.dfdl-wg/docm… There is no substantive change here. I just put in the TBDs people asked for, fixed a few things where extensibility was being impacted, and fixed typos. ...mikeb Mike Beckerle STSM, Architect, Scalable Computing IBM Software Group Information Integration Solutions Westborough, MA 01581 voice and FAX 508-599-7148 home/mobile office 508-915-4795

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DFDL WG call 2006-06-28
by Mike Beckerle 28 Jun '06

28 Jun '06

Attendees: Geoff Judd, Bob McGrath, Mike Beckerle We discussed the "consolidated" document, w.r.t. folding in missing sections. We discussed that updating the sections on conversions, and extensions should wait for current work on conversions and groups to draw some conclusion. We discussed that the arrays material needs to be segmented to fit the outline of basic material vs. detailed material. Bob said he'll try to do that or at least make notes in it about areas where there is uncertainty about where a section should go. Geoff will check with Steve Hanson about folding in the properties document. The latest IBM-internal version of this document needs at least to be stripped of IBM-specific material before we publish it to the WG. The big properties list will again raise the issue of how to segment into core + extra packages, and what is core and what is extension. That's ok, we need to have that discussion. There are several sections such as the work Geoff lead on optionals/default/nullable, etc. and also on wildcard behavior that need to get folded in, but without the properties to refer to it's very unclear how to put these sections in. They are in some sense about the meanings of specific groups of properties and their interactions. Question for the group: does anyone have anything written about layering and hidden layers that is newer than last september's "draft" document. There was material there about layering that I did not bring forward into the "consolidated" document yet because I wasn't sure if it was still current or not.. Mike Beckerle STSM, Architect, Scalable Computing IBM Software Group Information Integration Solutions Westborough, MA 01581 voice and FAX 508-599-7148

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DFDL Telcon tomorrow
by Westhead, Martin (Martin) 28 Jun '06

28 Jun '06

Hi folks, a reminder for tomorrow - I will not be there (I am on a training course). Martin Time: 9am PDT Number: 1-800-664-0771 At the automated answering system, press 0 for the operator. Ask for the "Daffodil working group" call.

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Telcon notes 2006-06-21
by Westhead, Martin (Martin) 21 Jun '06

21 Jun '06

Present Martin Westhead Bob McGrath Mike Beckerle Geoff Judd Steve Hanson Discussion We reviewed status: * Geoff and Martin have been discussing the issues of separators at different levels * Mike has been working on bringing the concepts of properties and variables together * We still have an unassigned action to assemble a draft document from the current pieces - Mike is going to make a start on this. * There are outstanding edits to the arrays document that Bob is ready to make he is waiting for the outline document. Note: Martin will not be on the next 2 calls due to training and vacation.

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Telcon now
by Westhead, Martin (Martin) 21 Jun '06

21 Jun '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 Spec document outline: Introduction section * glossary * What is DFLD? * Model Language basics * syntax * scoping and context * guards and selectors on annotations * basic arrays * variables * layering (hidden layers and value calc/referencing) Detailed semantics * properties and conversions Arrays Built-in specifications Extensions

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