[DFDL-WG] DFDL discriminators v5

[Alan Powell]

The latest, and hopefully the last, discriminators write-up which 
incorporates comments from Steve H and Stephanie.

Steve questioned:   It is a processing error if none of the choice 
branches are known to exist.
Steve: I know we agreed on this but I?m concerned that I am now unable to 
model the situation where I have a header, a footer, and in between either 
nothing or exactly 1 of a choice of n records 

Also the WG agreed that:
Discriminators are not allowed on 
- Global groups and the top level sequence or choice of a global group.
- Global element decalrations
- The top level group of a complex type.
- Anonymous groups other than when it is the top level of a choice branch. 


Which I think reduces to 
dfdl:discriminator can be an annotation on 
·       a local xs:element declaration 
·       an xs:element reference 
·       an xs:group reference 
·       an xs:sequence (when the top level of a choice branch) 
·       an xs:choice (when the top level of a choice branch)




Regards

 
Alan Powell
 
Development - MQSeries, Message Broker, ESB
IBM Software Group, Application and Integration Middleware Software
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