[DFDL-WG] Minutes for OGF DFDL Working Group Call, March 10-2010
Alan Powell
alan_powell at uk.ibm.com
Tue Mar 16 08:39:04 CDT 2010
Open Grid Forum: Data Format Description Language Working Group
OGF DFDL Working Group Call, March 10-2010
Attendees
Suman Kalia (IBM)
Steve Hanson (IBM)
Alan Powell (IBM)
Steve Marting (Progeny)
Stephanie Fetzer (IBM)
Tim Kimber(IBM)
Apologies
Mike Beckerle (Oco)
1. Spec issues
documentFinalTerminatorCanBeMissing:
Let's try to avoid creating another property for the postfix separator
scenario. I think this property provides a way of modelling the data
naturally.
We can recommend use of infix-with-a-terminator rather than 'postfix' if
the final terminator can be missing.
WG deferred any changes the property at this stage
dfdl:lengthKind endOfParent
'endOfParent' has almost the same meaning as 'delimited' so should have
the same semantics.
· the item?s terminator (if specified)
· an enclosing construct?s separator or terminator
· the end of an enclosing construct designated by its known length
· the end of the data stream
The effect would be the the element could be ended by the nearest known
length parent not just the immediate parent. Also the immediate parent
could have lengthKind 'implicit'
Agreed with the definition and that dfdl:lengthKind 'endOfParent should
apply to simpleTypes only.
dfdl:lengthUnits 'characaters'
LengthUnits 'characters' is currently for simple representation 'text'
only. Should it be allowed for complex?
Agreed dfdl:lengthUnits should be allowed on complex elements. The
characters are in the encoding of the complex element. The endocings of
the children must be the same as the parent..
Selectors
Should they be moved to an appendix.
Agreed should moved
DFDL Expression Syntax
Value comparison operators are 'eq' 'lt' 'gt' etc not '=' '<' '>' because
these were defined poorly in XPATH v1 and replaced in XPATH V2.
Unfortunately most examples us '=' etc
The examples need changing and '=' '<' will not be accepted
Syntax of expressions in string literals. Add
A DFDL string literal which begins with { and does not end with } does
not need to have its leading { escaped.
The syntax rules for expressions are
· Must start with a '{' in the first position and end with '}' in
the last position.
· '{' in any other position if treated as a literal
· '}' in any position other than the last position is treated as a
literal.
· '{{' as the first characters are treated as the literal '{' and
not a DFDL expression.
IgnoreCase
Should ignoreCase apply to numberInfinityRep and numberNaNRep
Agreed
Escapes.
Should escapeCharacter, escapeEscapeCharacater etc allow DFDL expressions.
Agreed
OutputNewLine should allow an expression
Agreed
Clarify dfdl: InputValueCalc and outputValueCalc
It is a schema definition error if both inputvalueCalc and outputValueCalc
are specified.
InputValueCalc is examined on unparsing so needs to be added to unparsing
property precedence.
Action to review inputValueCalc and putputValueCalc
2. Current Actions:
Updated below
3 Status of specification (for OGF28)
Draft 40 will be published by tomorrow and submitted to OGF on friday.
Meeting closed, 14:10
Next call Wednesday 10 March January 2010 13:00 UK (9:00 ET)
NOTE: East coast is 4 hours behind the UK for the next two weeks
Next action: 085
Actions raised at this meeting
No
Action
084
Check behaviour of dfdl:inputValueCalc and outputValueCalc.
Current Actions:
No
Action
066
Investigate format for defining test cases
25/11:IBM to see if it is possible to publish its test case format.
04/12: no update
09/12: no update
16/12: reminded dent to project manager
23/12: SH will send another reminder.
06/01: Another reminder will be sent
13/01: no update
20/01: no update
27/01: no progress
29/01: no progress
03/02: IBM is still investigating
10/02: IBM is still investigating
17/02: IBM is willing in principle to publish the test case format and
some of the test cases. May need some time to build a 'compliance suite'
24/03: No progress
03/03: Discussions have been taking place on the subset of tests that will
be provided.
10/03: work is progressing
084
Check behaviour of dfdl:inputValueCalc and outputValueCalc.
Closed actions
No
Action
080
AP:Clarify semantics of fn:poisition and fn:count
17/02: no progress
24/03: No progress
03/03: no progress. There are other functions which return a duration
which need investgating
10/03: changed to dfdl:position and dfdl:count. closed
Work items:
No
Item
target version
status
005
Improvements on property descriptions
not started
012
Reordering the properties discussion: move representation earlier, improve
flow of topics
not started
036
Update dfdl schema with change properties
ongoing
042
Mapping of the DFDL infoset to XDM
none
not required for V1 specification
070
Write DFDL primer
071
Write test cases.
083
Implement RFC2116
Regards
Alan Powell
Development - MQSeries, Message Broker, ESB
IBM Software Group, Application and Integration Middleware Software
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