Open Grid Forum: Data Format Description Language Working Group

OGF DFDL Working Group Call, February-18-2009,


Attendees
Alan Powell (IBM)
Steve Hanson (IBM)
Dave Glick (drac)

Apologies
Mike Beckerle(Oco)


1. XSD 1.1
Discussion deferred

2. Escape Schemes

Further discussion of latest proposal.

Noted the need to properly describe the function of  escapeSceheme and in particular distinguish from substitution mechanisms such as XML entities which are sometimes called escapes.

SH felt there could be confusion with the two use cases of escapeCharacter. Suggested separate properties.
Action SH to document issues and improve wording

Discussed whether comment type escapes should be supported. Decided they are not needed on V1. AP to confirm that if IBM products provide support.

2. Review Actions

Action 20 - There had been a number of email exchanges following on from last weeks call.
Decided to keep 'zoned' as it is well known to users who need the support.

Discussion on whether dfdl should allow unsigned logical types to have 'signed' phsyical representation. If so what should be the behaviour when there is a mismatch of signs.
Action: AP to describe behaviour

3. calendarFormats

SH and AP have been discussing the behaviour of strict and lax parsing which needs a more complete description.

4. TypeSubsitution

AP raised whether typeSubstitution needs to be supported in DFDL v1.

5. AOB

DG to take a look at Work items 5 and 12 while continuing review
MB will not be available next week
Next call 25 February 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
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.
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
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.

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



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