[DFDL-WG] DFDL: Minutes from OGF WG call, 22 July 2008

[Alan Powell]

Open Grid Forum: Data Format Description Language Working Group

Weekly Working Group Conference Call
13:00 GMT, 22 July 2008


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



1. Update to Decimal supplement
Discussed MB comments on SH decimal supplement document.
Agreed
- added zeroSign to  packedDecimalSignCodes which allows zero to be 
represented as all zero nibble
- Move numberCheckPoicy out of dfdl:DefineNumberFormat (renamed to 
dfdl:DefineTextNumberFormat) so it can apply to binary representation.
- add numberZeroRep to provide a special value for zero. er 'zero' 

2. Discuss lengthKind issues 
Discussed lengthKind/scanability email distributed by AP
Need to add to table truncation,  fill for binary, more logical/physical 
type combinations such as logical number with text representation.

lengthKind=Implicit
  no pad/ fill for sequences
  Long discussion on what the implicit length should be on unparse for 
various logical/physical type combinations. 
Decimal/integer with text representations look a problem.  Action: SH to 
propose algorithm
For number/text decided that min/maxInclusive would only be used for 
validation and not for any physical attributes. 
Action: Check all simple types vs representation and investigate if 
numberFormat can be used.             .
LengthKind=explicit
Decided for choice dfdl=length will be used, choiceKind is only used for 
lengthKind=implicit
Discussion of truncation is logical length is too big.
Decided that truncation is only valid for fixed length strings and we need 
a new property to control whether it is valid or not.
Action: propose new fixed length string truncation property.

For text numbers if numberpattern produces a text string that is too long 
at runtime then it is a runtime error.

lengthKind=prefixed
Decided that there is no padding for variable length lengthKinds

Will carry on discussion on next call


3. Hidden proposal
Not discussed

4. Unresolved WTX issues
Not discussed

5. AOB
Next weeks (30 July) call will start at 13:00 UK for 2 hours in stead of 
an additional call.


Meeting closed, 14:30 GMT
Actions raised at this meeting

No
Action 
009
SH: propose algorithm unparse length lengthKind=implicit decimal 
type/binary representation
010
AP: Document Fixed length string truncation property
011
SH: Update decimal supplement


Current Actions:
No
Action 




003
AP: Update spec from WTX document
16/7: in progress
004
MB: Mike will also author a new section in response to comments from Sandy 
Gao and Suman Kalia, explicitly connecting syntax with DFDL semantics
16/7: no progress


006
SH: Distribute hidden proposal
16/7: Done. MB to review
007
AP: enum + expression wording 
16/7: no progress



033 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) 
004
Selectors (Suman) - Apr 30, 2008
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) - *complete but 
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 *
013
(from F2F) New scoping rules
014
(from F2F) Occurs, OccurSeparator changes
015
(from F2F) choices and Output (Mike)
016
(from F2F) xpath forward references (Alan)
017
(IBM WTX review) Minor agreed updates (Alan)
018
(IBM WTX review) Review generateNewLine (Alan)
020
(IBM WTX review) Special value for zero seen eg 'zero'. (Steve)
021
(IBM WTX review) 'EndOfData' changes (Alan)
022
(IBM WTX review) Unresolvable choices - infoset changes
023
(IBM WTX review) separatorKind=?prefix? ?infix? or ?postfix? (Alan)
024
(IBM WTX review)  StopValue clarification (Alan)
025
Augmented infoset and unparsing (Alan)




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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