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






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