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[Bug 6540] New: Available documents in assertions

From: <bugzilla@wiggum.w3.org>
Date: Sun, 08 Feb 2009 18:45:00 +0000
To: www-xml-schema-comments@w3.org
Message-ID: <bug-6540-703@http.www.w3.org/Bugs/Public/>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=6540

           Summary: Available documents in 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: David_E3@VERIFONE.com
        ReportedBy: mike@saxonica.com
         QAContact: www-xml-schema-comments@w3.org
                CC: cmsmcq@blackmesatech.com


In defining the dynamic context for XPath evaluation (section 3.13.4.2) we say
that available documents is empty, but available collections and the default
collection are implementation defined.

There is no logic to making these different. Either all three should be empty,
or all three should be implementation defined.

I think there are many use cases for writing assertions that make access to
external documents; for example one can check that the value of an EMPNR
attribute corresponds to a value that is present in some external document or
database. However, there are also many difficulties - in particular it means
that the validity of the attribute depends heavily on the environment in which
validation is performed. Making the values of these context properties
implementation-defined would pass the buck to implementors to solve these
problems if they can find a way of doing it; I would be inclined to favour this
route over banning it out of hand.


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Received on Sunday, 8 February 2009 18:45:09 UTC

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