[DFDL-WG] DFDL: Minutes from OGF WG call, 21 January 2009

[Alan Powell]

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 at uk.ibm.com 
 Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898






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