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@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

No	Action
	AP: update spec with unparsing and augmented infoset.
	SH: Distribute hidden proposal
	AP: enum + expression wording

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