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From: Jeff Lowery
>I'm not sure either one is doing a complete job of validating the schema.
>While XSV is the most correct, it doesn't complain if you remove either
>act:name or act:desc from the key's field XPath (neither does SQC).
>It would seem that it should, since both fields are in a choice model
>group, and if the one in the key field is missing XSV will throw a
>document validation error.
XSV doesn't complain if you remove, say, the act:desc alternative from the
key field xpath, provided act:desc is never used in an activity instance.
However, if act:desc is used in an instance instead of act:name, it
complains "missing one or more fields...from key".
This seems right. The validation rule in 3.11.4 para 4.2 only requires that
all actual elements have unique keys. I don't see anything that requires a
processor to warn that some otherwise valid instance might have a missing
key.
Bob
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