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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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DFDL Telcon notes
by Westhead, Martin (Martin) 14 Jun '06

14 Jun '06

Present Mike Beckerle Martin Westhead Geoff Judd Bob McGrath Discussion This was a very useful discussion. We started by formulating the outline of the spec document and then reviewed some specific aspects of the new format document. 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 Extensibility - constructs like <dfdl:sequence> need to have their list of allowed properties extensible Format/defineFormat - is the dfdl:format tag correctly named. Martin assumed a catch-all dfdl annotation tag. Mike assumed that dfdl:format was *just* format and that other things (variable assignments, conversion definitions etc.) would go in different tags. More examples and investigation are required to see how this works in practice. defineFormat is probably too specific right now, this is an important reuse mechanism and it should be available to apply to all top level dfdl tags. One solution would be to have a more generic "define" tag that can contain "dfdl:format" tags along with others. Properties and variables - we expect that properties and variables have the same scoping, assignment and reference semantics. Properties are only different in the sense that they represent parameters to conversions. Linked properties - we discussed the need for linked properties, it seems like extra stuff that might not be required and it was useful to see if there were different ways to achieve the same goal. From the discussion it did not seem an unreasonable thing to include. Applies default - we reviewed the issues around the "applies" default (toScope or hereOnly) the current default is "hereOnly" different examples suggest different defaults are more appropriate. We decided to leave the decision where it was but a bigger selection of examples will probably help inform this decision. Actions * Assemble draft of spec document from the pieces that we have. (Currently unassigned - volunteers?)

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Telcon Now
by Westhead, Martin (Martin) 14 Jun '06

14 Jun '06

(Sorry for the late notice) Main item for the agenda is again Mike's scoping document. 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. https://webconferencing.avaya.com/default.htm?ConfRef=158671&Pin=139469

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Telcon notes 2006-06-07
by Westhead, Martin (Martin) 07 Jun '06

07 Jun '06

Present Martin Westhead Mike Beckerle Steve Hanson Suman Kali Bob McGrath Discussion We had a short discussion where Mike gave a brief overview of some of the features of the new scoping document. We agreed on two agenda items for next week: * Detailed discussion of scoping * Assembling a complete spec document: what pieces are required? What work needs to be done? Deadline to present at GGF in DC in October.

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