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[Bug 4273] [FS] data on element()

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Date: Tue, 17 Feb 2009 20:44:51 +0000
To: public-qt-comments@w3.org
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--- Comment #49 from Michael Dyck <jmdyck@ibiblio.org>  2009-02-17 20:44:51 ---
Here is (I hope) my final summary of the possible resolutions for this bug,
in order of increasing impact (as judged by me):

0) Do nothing, leave the 'data on' judgment unsound.

1) In the case of an element type whose type annotation is a complex type
   of mixed content, where the 'data on' judgment currently has a rule that
   infers xs:untypedAtomic (which is unsound), instead raise a type error.
   (So, remove the rule and put in a paragraph saying it's an error.) This
   is the minimal change that achieves soundness.

2) Write rules to examine the type hierarchy in the ISSD. In some cases
   (where the ISSD contains no complex types of element-only content),
   static analysis could avoid raising a type error from 'data on'. But
   inferring xs:untypedAtomic would still be unsound, we would have to
   infer xs:anyAtomicType* (which might cause subsequent type errors,
   depending on the context).

3) Change fn:data's type error err:FOTY0012 to a dynamic error, so static
   analysis is no longer required to raise it statically.

4) Changes beyond that are probably out of scope for the 1.0/2.0 second
   edition timeframe.

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