[DFDL-WG] Proposal to simplify null/optional/default handling

[Steve Hanson]

Mike, I'm trying to buy into the proposal that the provision of default 
values on output is not the business of the unparser but I'm having 
trouble. On the face of it that sounds ok, but I'm bothered with the 
asymmetry with the parser, where we expect the parser to take a byte 
stream with absent values and fill in defaults. To be analogous with the 
unparser, wouldn't the parser then fire events saying 'absent' and let the 
receiver fill in the defaults?  We'll be asked to justify this to wider 
audience and it needs to be defendable, I'm not sure it currently is....?

Regards, Steve

Steve Hanson
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Hursley, UK
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Mike Beckerle <beckerle at us.ibm.com> 
Sent by: dfdl-wg-bounces at ogf.org
16/08/2007 17:23

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Subject
[DFDL-WG] Proposal to simlify null/optional/default handling







This proposal is a radical simplification of this stuff. Really collapses 
it massively. Please give it some thought. 

I did go through this with Geoff Judd who did the original research into 
the complexity of this area. 



Mike Beckerle
STSM, Architect, Scalable Computing
IBM Software Group
Information Platform and Solutions
Westborough, MA 01581
direct: voice and FAX 508-599-7148
assistant: Pam Riordan 
                 priordan at us.ibm.com 
                 508-599-7046
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