Open Grid Forum: Data Format Description Language Working Group

Weekly Working Group Conference Call
15:00 GMT, 16 January 2009

Attendees

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

1. Non-supported XSD constructs in DFDL schema

It was agreed that dfdl v1 will not allow non-supported XSD constructs, such as attributes, to exist in dfdl schema. That is they will be treated as errors rather than ignored.

2. XSD 1.1

For next meeting we will revisit the list of areas to be investigated produced by MB

3. Padding to minlength

Proposal documented in last call ( 10 December 2008) was approved

4. Implicit Lengths

Decided to disallow zoned for Float and Double. Approved

Use numberPattern for all zoned lengths instead of fixed length implied by type - Approved

Discussed using virtual decimal point and/or farctional digits for implied length of decimal. Decided against.

Need to complete for Date/Time, Date, Time
Drop DFDL support for duration as a logical type. Action: check with WTX

Simple type	text (+ xml)	binary
String	Length/maxlength	n/a
Float	Text: numberPattern (length of positive subpattern)	32
Double	Text: numberPattern	64
Decimal/Integer	Text: numberPattern Zoned:numberPattern	Pkd/bcd: (TotalDigits+1)/2
Long, UnsignedLong	Text: numberPattern Zoned:numberPattern	binary: 64 Pkd/bcd: (TotalDigits+1)/2
Int, Unsignedint	Text: numberPattern Zoned:numberPattern	binary: 32 Pkd/bcd: (TotalDigits+1)/2
Short, Unsignedshort	Text: numberPattern Zoned:numberPattern	binary: 16 Pkd/bcd: (TotalDigits+1)/2
Byte, Unsignedbyte	Text: numberPattern Zoned:numberPattern	binary: 8 Pkd/bcd: (TotalDigits+1)/2
DateTime	Calendarpattern
Date	Calendarpattern
Time	Calendarpattern
Duration	Calendarpattern
Boolean	Length of textBooleanTrue	32
HexBinary	n/a	Length/maxlength

5. Calendar formats

Briefly discussed supplement emailed by AP. Has been updated and will be redistributed

Note change from SecondsSinceEpoc and milliSecondsSinceEpoc to binary not implemented as it was based on using length of logical type to decide which to use but DateTime, Date and Time types do not have variable length.

3. Zoned Decimal

Discussed behaviour of IBM iSeries not overpunching positive numbers. Approved changes.

4. AOB
Next call 21 January 14:00

Meeting closed, 16:00 GMT

Actions raised at this meeting

No
Action

030
AP: confirm with WTX that can drop duration

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

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

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

Closed actions:

003
AP: Update spec from WTX document
13/8: All resolved issues have been added to spec. Remaining unresolved items need discussion
10/9: Alan will pull out the remaining unresolved items and circulate for discussion next week
17/9: Doc distributed and partially discussed
15/10: All updateds complete except minlength
22/10: No update
12/11: Updates have been sent to wtx to review. Will chase up for comments
16/1: Updates have been made to spec v033. Closed

018
AP: Agree padding to minimum length
15/10: Needs documenting
22/10: No update
26/11: discussed and AP to suggest dfdl:minlength
16/1: proposal approved. 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@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
030	AP: confirm with WTX that can drop duration

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

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
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

003	AP: Update spec from WTX document 13/8: All resolved issues have been added to spec. Remaining unresolved items need discussion 10/9: Alan will pull out the remaining unresolved items and circulate for discussion next week 17/9: Doc distributed and partially discussed 15/10: All updateds complete except minlength 22/10: No update 12/11: Updates have been sent to wtx to review. Will chase up for comments 16/1: Updates have been made to spec v033. Closed
018	AP: Agree padding to minimum length 15/10: Needs documenting 22/10: No update 26/11: discussed and AP to suggest dfdl:minlength 16/1: proposal approved. Closed

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