Open Grid Forum: Data Format Description Language Working Group

Weekly Working Group Conference Call
14:00 GMT, 28 January 2009


Attendees
Alan Powell (IBM)
Mike Beckerle(Oco)
Steve Hanson (IBM)


1. XSD 1.1
SH and AP will arrange a call with Sandy Gao

2. Escape Schemes

Discussed proposal distributed by AP
Escape schemes apply to all logical types with text representation
As with other defnexxxFormats it is the escapeSchemeRefermce that is in scope not the properties within the escape scheme.

SH proposed allowing multiple escape refs for each alternate escape delimiter pairs rather than defining them in on escape scheme.

When escapeSchemeRef  is blank then no escape scheme applies

Discussion about whether escape schemes apply to known length as well as variable length text fields. Earlier decision to scan known length text fields for parent syntax items  implies need to allow escape.

Suggested syntax
1. escapeSchemeRef= blank means no escaping and don't scan
2. escapeSchemeRef=something but escape delimiters and escapecharacter are blank means no escape but scan for syntax
3. escapeSchemeRef=something but escape delimiters and escapeCharacter are something means escape and scan for syntax
Subsequent discussions indicate that some products scan if there are syntax items in scope even if known length. Needs further discussion.

Need to discuss if comment escapes should be supported.

4. AOB
Next call 04 February 14:00

Meeting closed, 15:00 GMT

Actions raised at this meeting
No
Action
031

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,
020
SH: Resolve packedDecimalSignCodes behaviour depends on NumberCheckPolicy
22/10: No progress
10/12: added how to decide to overpunch and sign position
023
MB: Review Schema 1.1
29/1: AP and SH to talk to Sandy Gao
024
String XML type
025
Escape schemes
21/1: discussed requirements
026
SH: Envelopes and Payloads
027
Property precedence tables
028
Variable markup
029
 valueCalc (output length calculation)
030
AP: confirm with WTX that can drop duration
21/6: WTX confirm that they do not have a duration type so do not need it in dfdl. Will drop from spec. Closed

Closed actions:
030
AP: confirm with WTX that can drop duration
21/6: WTX confirm that they do not have a duration type so do not need it in dfdl. Will drop from spec. Closed

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

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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