[DFDL-WG] Make dfdl:initiatedContent discriminating

[Steve Hanson]

Alan

Is the question really that initiators should always be discriminating?

Regards

Steve Hanson
Programming Model Architect
WebSphere Message Brokers
Hursley, UK
Internet: smh at uk.ibm.com
Phone (+44)/(0) 1962-815848



Alan Powell/UK/IBM at IBMGB 
Sent by: dfdl-wg-bounces at ogf.org
06/08/2009 17:15

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[DFDL-WG] Make dfdl:initiatedContent discriminating







Currently dfdl:initiatedContent is used purely as a check that all the 
content of a sequence or choice have an initiator specified. 
initiatedContent 
Booloean 
When 'true' indicates that all the children of the choice are initiated. 
It is a schema definition error if any children have their dfdl:initiator 
property set to the empty string. 
When 'false', the children of the choice may have their dfdl:initiator 
property set to the empty string. 
Annotation: dfdl:sequence, dfdl:choice, dfdl:group 



It would help implementations decide more quickly if optional complex 
elements are present, and therefore have to save state less often,  if 
initiatedContent was also made discriminating. I would expect that in most 
uses cases the initiator is the discriminator so this change would make 
that simpler to specify. The same effect can be achieved by adding a 
dfdl:discriminator to each element but that is having to specify the same 
intent twice. 

If the initiator is not the discriminator then initiatedContent can be set 
to 'false'.  You lose the schema checking but this is a less common case. 

What do you think? 

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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