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[Bug 22721] New: [xslt 3.0] Streamability of attribute-sets

From: <bugzilla@jessica.w3.org>
Date: Thu, 18 Jul 2013 13:22:16 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-22721-523@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=22721

            Bug ID: 22721
           Summary: [xslt 3.0] Streamability of attribute-sets
    Classification: Unclassified
           Product: XPath / XQuery / XSLT
           Version: Candidate Recommendation
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSLT 3.0
          Assignee: mike@saxonica.com
          Reporter: mike@saxonica.com
        QA Contact: public-qt-comments@w3.org

We say that an xsl:element instruction (say) with a use-attribute-sets
attribute can be streamable if the attribute set is streamable.

This assumes that at the time we do the streamability analysis, we know which
attribute-set will be used. But since this binding is not determined until all
the packages making up the stylesheet have been assembled, the result is that
we can't assess streamability on a single package individually. This seems
unfortunate, especially as streaming may cause radical changes to the way a
package is compiled.

In practice most attribute sets will be motionless so it's a shame to disallow
their use simply because of the remote possibility of free-ranging behaviour.

We could add an attribute streamable=yes|no to xsl:attribute-set and say that
if streamable=yes is specified, the body must be motionless.

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