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[Bug 6314] New: XPath subset for assertions

From: <bugzilla@wiggum.w3.org>
Date: Tue, 16 Dec 2008 14:28:48 +0000
To: www-xml-schema-comments@w3.org
Message-ID: <bug-6314-703@http.www.w3.org/Bugs/Public/>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=6314

           Summary: XPath subset for assertions
           Product: XML Schema
           Version: 1.1 only
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Structures: XSD Part 1
        AssignedTo: cmsmcq@w3.org
        ReportedBy: mike@saxonica.com
         QAContact: www-xml-schema-comments@w3.org


This is raised in response to some discussion on xml-dev today which points out
that the specs are unclear on a significant question.

In the status section of the current published working draft we say:

"The minimal subset of XPath which processors were required to support for
assertions has been eliminated; processors must support all of XPath." 

But in section 3.13.1 Assertions we say (and this is still in the status quo):

"Conforming processors may implement all of [XPath 2.0]  or may restrict
themselves to the subset described below. Interoperability among all conforming
implementations is best achieved by restricting XPath expressions to the
subset."

Moreover it's not very clear what "below" refers to. The sentence quoted is
followed by some very informally-stated rules like "Path steps are restricted
to only match information items within the element being ·assessed·." - is that
what is meant? These statements look to me like a non-normative description of
a subset, not like a normative definition. The only XPath subsets we define are
now in sections 3.11 and 3.12, and they are above rather than "below".

Michael Kay


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Received on Tuesday, 16 December 2008 14:29:56 GMT

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