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[Bug 2528] [xqueryx] check for node tests in xsl

From: <bugzilla@wiggum.w3.org>
Date: Wed, 16 Nov 2005 00:09:12 +0000
To: public-qt-comments@w3.org
Cc:
Message-Id: <E1EcArQ-0006Ed-0f@wiggum.w3.org>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=2528

           Summary: [xqueryx]  check for node tests in xsl
           Product: XPath / XQuery / XSLT
           Version: Candidate Recommendation
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XQueryX
        AssignedTo: jim.melton@acm.org
        ReportedBy: davidc@nag.co.uk
         QAContact: public-qt-comments@w3.org


<xsl:template match="xqx:functionCallExpr">
    <xsl:if test="xqx:functionName/@xqx:prefix">
      <xsl:value-of select="xqx:functionName/@xqx:prefix"/>
      <xsl:value-of select="$COLON"/>
    </xsl:if>
    <xsl:if test="xqx:functionName = 'node' or
                  xqx:functionName = 'document-node' or
                  xqx:functionName = 'element' or
                  xqx:functionName = 'attribute' or
                  xqx:functionName = 'schema-element' or
                  xqx:functionName = 'schema-attribute' or
                  xqx:functionName = 'processing-instruction' or
                  xqx:functionName = 'comment' or
                  xqx:functionName = 'text' or
                  xqx:functionName = 'item' or
                  xqx:functionName = 'if' or
                  xqx:functionName = 'typeswitch' or
                  xqx:functionName = 'empty-sequence'">
      <xsl:text>fn:error()</xsl:text>
    </xsl:if>
    <xsl:value-of select="xqx:functionName"/>


The check on 'node' and friends needs to be moved into a branch that only
happens if there is no xqx:prefix. Currently the stylesheet rejects the xqx
version of the valid, executable XQuery


declare namespace x = "x";
declare function x:text () {()};
x:text()
`

as it rejects any function with local name "text".

The result of the stylesheet in this case also reveals a couple more problems


declare namespace x="x";
 declare function x:text()
{
()
};
x:fn:error()text()

The resulting Query does not include a call to fn:error() as intended as this is
mixed up with the function call that is being flagged as an error,and the result
is that the Query does not parse, which is a kind of error, but I don't think it
was as intended. It would be easy to arrange the template so that in the branch
that generates error() the original function nameand arguments were dropped
completely, although this would then still fail if fn: namespace has been
redeclared. It would be safer to generate the error message during the
transformation with an xsl:message terminate="yes" rather than trying to cause
the generated query to always raise an error.



and for completeness the xqueryx version of the Xquery test shown above:

<xqx:module xmlns:xqx="http://www.w3.org/2005/XQueryX">
   <xqx:mainModule>
      <xqx:prolog>
         <xqx:namespaceDecl>
            <xqx:prefix>x</xqx:prefix>
            <xqx:uri>x</xqx:uri>
         </xqx:namespaceDecl>
         <xqx:functionDecl>
            <xqx:functionName xqx:prefix="x">text</xqx:functionName>
            <xqx:paramList/>
            <xqx:functionBody>
               <xqx:sequenceExpr/>
            </xqx:functionBody>
         </xqx:functionDecl>
      </xqx:prolog>
      <xqx:queryBody>
         <xqx:functionCallExpr>
            <xqx:functionName xqx:prefix="x">text</xqx:functionName>
            <xqx:arguments/>
         </xqx:functionCallExpr>
      </xqx:queryBody>
   </xqx:mainModule>
</xqx:module>
Received on Wednesday, 16 November 2005 00:09:26 GMT

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