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[Bug 12450] New: [XSLT 3.0] Need rules for default priority of new kinds of pattern

From: <bugzilla@jessica.w3.org>
Date: Fri, 08 Apr 2011 08:28:07 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-12450-523@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12450

           Summary: [XSLT 3.0] Need rules for default priority of new
                    kinds of pattern
           Product: XPath / XQuery / XSLT
           Version: Working drafts
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSLT 3.0
        AssignedTo: mike@saxonica.com
        ReportedBy: mike@saxonica.com
         QAContact: public-qt-comments@w3.org


The rules in section 6.5 (Default Priority of Template Rules) should be
reviewed for new ItemTypes introduced in XPath 3.0:

function items
union types
maps

There's a fallback rule that gives these all a priority of 0.5, but it's not
clear this is the best we can do.

For a union type I would suggest "the minimum priority of the atomic types in
the transitive membership of the union, minus 0.5." This gives union(date,
dateTime) a lower priority than dateTime but a higher priority than
anyAtomicType, and it gives union(ID, IDREF) a lower priority than IDREF but a
higher priority than NCName.

We specify the default priority for ~function(*) as -1; I suggest that any more
specific function type should have priority zero, ~map(*) should have +0.5, and
the default priority of ~map(K,V) should be the default priority of K.

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Received on Friday, 8 April 2011 08:28:09 UTC

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