Open Grid Forum: Data Format Description Language Working Group OGF DFDL Working Group Call, March-11-2009 Attendees Alan Powell (IBM) Steve Hanson (IBM) Dave Glick (drac) Suman Kalia (IBM) Apologies Mike Beckerle(Oco) Tim Kimber (IBM) 1. Specialized Annotations Discussed SH proposal for using specialized annotations. Generally thought to be reasonable if details can be worked out. Additional suggestion for dfdl:format and dfdl:complextype to allow specialized annotaions as children rather than them being the union of all properties. Led to perhaps allowing scoped properties to be tied to specialized annotation. eg dfdl:sequence lengthKind and dfdl:element: lengthKind. Identified problem with short form properties on complexType, which specialized annotation should they apply to? SH to update proposal. 2. Escape Schemes IBM have done work to complete the current proposal (006) to provide a general mechanism that covers all cases and have concluded that it ends up to be much to complicated. They have suggested a simplified version that covers that major cases only. Summary. : allow a single reference on field to an escape scheme. The escapeScheme defines one of 3 different escape alternatives - escapeCharacter and escapeforescapeCharacter - escape surround/bracket with escapeforescapeCharacter - escape surround/bracket with alternate escape surround/bracket Also suggested adding property to list 'Other characters that need to be escaped' as a catchall mechanism AP document simplified proposal 3. Validation ranges and exclusion lists. General agreement that validation outside that provided by schema validation should be avoided. Discussed SH emailed proposal to use unions to define validation ranges. Need to decide if benefit of validation ranges has enough value to justify the complication of allowing limited union support. Be prepared to decide on the next call. 4. AOB To be discussed - Consuming extraneous data after schema has be used. - 'Floating' definitions - Actions Next call 18 March 14:00 Meeting closed, 15:00 GMT Actions raised at this meeting No Action Current Actions: No Action 012 AP/SH: Update decimalCalendarScheme 10/9: Not allocated yet 17/9: No update 24/9: Add calendar binary formats to actions 22/10: No progress 16/1: proposal distributed and discussed. Will be redistributed 21/1: add locale, 04/02: changed from locale to specific properties 18/2: Need more investigation of ICU strict/lax behaviour. 020 SH: Resolve packedDecimalSignCodes behaviour depends on NumberCheckPolicy 22/10: No progress 10/12: added how to decide to overpunch and sign position 11/02: proposal largely agreed. SH to make minor changes 18/02: AP to document unsigned type behaviour 25/02: no progress 023 MB: Review Schema 1.1 29/1: AP and SH to talk to Sandy Gao 04/02 Call arranged for Friday 11/02: Call took place. Identified useful changes. Consolidate with previous list. 04/03: decided to stay on Schema 1.0. 024 String XML type 025 Escape schemes 21/1: discussed requirements 04/02: AP/SH to describe behaviour for known length text fields. Need to discuss if comment escapes should be supported. 11/02 new draft distributed: 18/02: SH up document concerns 25/02: SH and AP have refined proposal ready for approval. 04/03: SH and AP have further refined proposal. 11/03: discussed. suggested a simplified proposal be evaluated. 026 SH: Envelopes and Payloads 027 Property precedence tables 028 Variable markup 029 valueCalc (output length calculation) 031 DG: Review dfdl v033 11/02: Initial comments received 18/02: Will include work items 5 and 12. 11/03: complete 032 DG: Investigate compatibility between DFDL infoset and XDM 033 04/03: Assert/Discriminator semantics. AP to document. TK to check uses of discriminator besides choice. 034 04/03: AP remove redundant properties Closed actions: 034 Work items: No Item 001 String XML type (Ian P) - Apr 30, 2008 002 Escape schemes (Ian P) - Apr 30, 2008 003 Variables - ??, 2008 (Mike) 005 Improvements on property descriptions - ??, 2008 (All - split TBD) 006 Envelopes and Payloads (Steve) - Apr 30, 2008 007 (from draft 32) valueCalc (Mike) - ??, 2008 mostly complete 008 (from draft 32) Property precedence for writing (Steve) - under review 009 (from draft 32) Variable markup (Steve) - Mar 31, 2008 proposal needs writing up 010 (from draft 32) Assertions, discriminators and choice, including discussion of timing option (Suman) - Mar 31, 2008 * in progress * 011 (from draft 32) How speculative parsing works (combining choice and variable-occurence - currently these are separate) ??, 2008 (IBM) in progress 012 (from draft 32) Reordering the properties discussion: move representation earlier, improve flow of topics ??, 2008 (Alan) * not started * 025 Augmented infoset and unparsing (Alan) added but needs work 026 Remove duration complete - specification updated 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 Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. 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