Open Grid Forum: Data Format Description Language Working Group

Weekly Working Group Conference Call
14:00 GMT, 21 January 2009


Attendees
Alan Powell (IBM)
Mike Beckerle(Oco)

Apologies
Steve Hanson (IBM)


1. XSD 1.1
Deferred to next call

2. Calendar formats
Discussed updated (v4) supplement emailed by AP

Agreed millisec/secSinceEpoc cannot be implied by length of logical data so need seperate enumerations. Observed that these options were really combination of 3 properties  binary, length and sec/millisec.  Suggested renaming to binarySeconds and binaryMilliseconds

Packed calendars: decided that need to be able to specify at least the packedDecimalSignCodes property rather than assuming a default so reference will be added to calendar description

Locale needs to be specified  for numberformats and calendarFormats (didn't identify any other areas) as it modifies the behaviour of ICU. Decided to add  locale to numberFormat and CalendarFormat

3. Escape Schemes

Agreed need for multiple escape delimiter pairs but not nested.
Need an escape for escape character even though in most cases this will be the same character, eg /n //, There are some formats that have a different escape, eg /n &/. Only need single escape characters and one level of escape characters.
Discussed how to deal with comments of the form   /*  comment */  where the escape delimiters  are also the initiator and terminator of the field. Semantic needed is 'only look for field terminator not any parent terminator or any other syntax elements'. May fall out naturally from the speculative parsing rules. Need further discussion.

4. AOB
Next call 28 January 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
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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