[Bug 5074] substitution groups not that strictly limited

http://www.w3.org/Bugs/Public/show_bug.cgi?id=5074





------- Comment #4 from mike@saxonica.com  2008-01-03 09:44 -------
It's also worth noting that the general tone of section 2.2.2 is explanatory
and introductory: section 2 is headed "Conceptual Framework", and I think most
readers would not expect to find detailed rules about the validity of element
declarations in that section unless they are repeated elsewhere. In this case I
think it's fairly clear that the statement in 2.2.2.2 is intended as a summary
of the intent of rule 4 of Schema Component Constraint: Element Declaration
Properties Correct. 

This kind of thing is a minefield when writing specifications: it's often
helpful to give a high-level overview of the rules, but it's difficult to
ensure that this isn't mistaken for the real thing.

As for the original point: yes, a member of a substitution group can have
wildly different content from that of the substitution group head; but only to
the extent that the definition of the head element permits this.

Received on Thursday, 3 January 2008 09:45:08 UTC