[DFDL-WG] DFDL: Minutes from OGF WG call, 16 January 2009

[Alan Powell]

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 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





-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.ogf.org/pipermail/dfdl-wg/attachments/20090120/ef45f814/attachment-0001.html