Open Grid Forum: Data Format Description Language Working Group

Weekly Working Group Conference Call
13:00 GMT, 13 August 2008


Attendees
Mike Beckerle (Oco)
Alan Powell (IBM)

Apologies: Steve Hanson (IBM)


1. Update to Decimal supplement
Wrong updated document was distributed in with the agenda. Correct one will be sent.

decimalCalenderScheme needs updating. Action created
Property Name Description
decimalCalendarScheme Indicates that decimal calendars are described by a defined calendar scheme.

An anonymous calendar scheme can be specified as a child element of the annotation element.

See Section TBD Error! Reference source not found..




2. Discuss lengthKind issues  
New Lengthkind document was distributed and discussion continued from last call

Decided dfdl will do minimal type conversion of binary numbers. Decimal and integer can have only have packed decimal  or BCD numberFormat.  Int, short, long, byte can only have 2sComplement.

MB didn't like endOfBitstream property as if is nit composable. Decided to separate  EoD from delimited again
and have special meaning that EOD on the last item of a top level sequence means endOfBitstream. MB to provide description and examples of use. Need to revisit the EndOfData property name.

MB not happy with lengthKind=pattern on binary fields. Would like use cases.

Decided not to support extended float (128 bit) until XML provides an simple type that matches.

MB agreed to use numberpattern with stated restrictions to calculated implict lengths of number/text fields. Discussion of what to do if conlficts with TotalDigits. Could decide not to support totalDigits.
max/min/Inclusive/exclusive for validation only.

3. Hidden proposal
Not discussed

4. Unresolved WTX issues
Not discussed

5. AOB
SH and AP away w/o 18 & 25 Aug. MB away w/o 1 Sept. Next call 10th Sept

Meeting closed, 14:30 GMT

Actions raised at this meeting
No
Action
012
??: Update decimalCalendarScheme
013
MB: Description and use cases for EndofData syntax
014
SH: Use cases for lengthKind pattern on binary fields.
015
AP: removed extended floats

Current Actions:
No
Action
003
AP: Update spec from WTX document
13/8:  All resolved issues have been added to spec. Remaining unresolved items need discussion
004
MB: Mike will also author a new section in response to comments from Sandy Gao and Suman Kalia, explicitly connecting syntax with DFDL semantics
16/7: no progress
006
SH: Distribute hidden proposal
16/7: Done. MB to review
13/8: MB to review
007
AP: enum + expression wording
13/8: no progress
009
SH: propose algorithm unparse length lengthKind=implicit decimal type/binary representation
13/8: AP has incorporated into lengthkind document. Done
010
AP: Document Fixed length string truncation property
13/8: done
011
SH: Update decimal supplement
13/8: Editorial changes needed.


033 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)
004
Selectors (Suman) - Apr 30, 2008
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) - *complete but 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 *
013
(from F2F) New scoping rules
014
(from F2F) Occurs, OccurSeparator changes
015
(from F2F) choices and Output (Mike)
016
(from F2F) xpath forward references (Alan) *complete*
017
(IBM WTX review) Minor agreed updates (Alan) *complete*
018
(IBM WTX review) Review generateNewLine (Alan) *complete*
020
(IBM WTX review) Special value for zero seen eg 'zero'. (Steve)
021
(IBM WTX review) 'EndOfData' changes (Alan)
022
(IBM WTX review) Unresolvable choices - infoset changes *complete*
023
(IBM WTX review) separatorKind=’prefix’ ‘infix’ or ‘postfix’ (Alan)
024
(IBM WTX review)  StopValue clarification (Alan)  
025
Augmented infoset and unparsing (Alan)  


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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