[DFDL-WG] DFDL: Minutes from OGF WG call, 25 June 2008

[Alan Powell]

Open Grid Forum: Data Format Description Language Working Group

Weekly Working Group Conference Call
14:00 GMT, 25 June 2008


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


1. Infoset order

It was agreed that the infoset needs to be in the schema order otherwise 
it would not be possible to know if elements were missing which needed 
defaulting on unparsing.

2. Unparsing, Augmented infoset.

Discussed latest version of description of unparsing including the 
introduction of the 'augmented infoset' concept. Agreed it can be added to 
spec.

3. Byte Order Mark.

Reviewed Unicode documents on BOM and concluded that DFDL should provide 
no special treatment so it will be treated as a normal code point. If a 
document contains an optional BOM then it should be defined as an 
optional, hidden field and an expression used to set the dfdl:byteOrder 
property.

4. enums and expressions

During the BOM discussion it was noted that current dfdl syntax rules do 
not allow expressions for enumerated properties. AP to make a proposal.

5. Hidden element syntax

Discussed IBM's outline proposal  for using groups to define hidden 
elements which would allow their syntax to be validated by an XML parser. 
Agreed in principle, SH to circulate detailed proposal.

6. Gridforge

Gridforge seem to be working again so will not look for alternatives

7. AOB

 MB on vacation for the next 2 weeks.


Meeting closed, 15:00 GMT

Actions raised at this meeting

No
Action 

AP: update spec with unparsing and augmented infoset.

SH: Distribute hidden proposal

AP: enum + expression wording 

Current Actions:
No
Action 

MB: update outputvalueCalc doc
Done

AP: Send out updated work item list

AP: Update spec from WTX document

MB: Mike will also author a new section in response to comments from Sandy 
Gao and Suman Kalia, explicitly connecting syntax with DFDL semantics


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






Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU












Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU





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