Subject: RE: [xsl] Function to accept node and name of subnode in parameter string From: "Bordeman, Chris" <Chris.Bordeman@xxxxxxxxxxxxxxxxx> Date: Wed, 20 Aug 2008 14:48:33 -0500 |
Ok that's perfect. Thanks Ken. -----Original Message----- From: G. Ken Holman [mailto:gkholman@xxxxxxxxxxxxxxxxxxxx] Sent: Wednesday, August 20, 2008 2:40 PM To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx Subject: Re: [xsl] Function to accept node and name of subnode in parameter string At 2008-08-20 14:29 -0500, Bordeman, Chris wrote: >Hi all. I need to create a 2.0 function that will accept an element()? >and a xs:string. The string will contain the name of a subnode of the >first parameter. > >The function will do something like this: > ><!-- Given any node and the name of a subnode, returns > the nonempty subnode's value or N/A --> <xsl:function >name="fn:ValueOrNA" as="xs:string"> > <xsl:param name="node" as="element()?"/> > <xsl:param name="childelementname" as="xs:string"/> > <xsl:choose> > <xsl:when test="$node and $node/$childname != ''"> > <xsl:value-of select="$node/$childname"/> > </xsl:when> > <xsl:otherwise> > <xsl:value-of select="'N/A'"/> > </xsl:otherwise> > </xsl:choose> ></xsl:function> > >But it always seems to return just the second string I pass in, not the >value of the subnode. Yes, because in XSLT 2.0 any step in a location path is allowed to be a primary expression of which a string literal is one. >What's the right way to do this? By making some assumptions on namespace prefixes and finding the node you are looking for. <xsl:when test="$node and $node/*[name(.)=$childname] != ''"> <xsl:value-of select="$node/*[name(.)=$childname]"/> </xsl:when> ... but the above assumes that your $childname contains the same prefix-qualified name as your input tree. If you only want to check on the name portion without the prefix, then you will need local-name(.) instead of name(.). If you need a complete namespace-safe solution then pass in a third argument: <xsl:param name="childns" as="xs:string"/> ... and the following test will work indpendent of any prefix chosen by the author of the document: <xsl:when test="$node and $node/*[local-name(.)=$childname and namespace-uri(.)=$childns] != ''"> <xsl:value-of select="$node/*[local-name(.)=$childname and namespace-uri(.)=$childns]"/> </xsl:when> I hope this helps. . . . . . . . . . . . . Ken -- Upcoming XSLT/XSL-FO hands-on courses: Wellington, NZ 2009-01 Training tools: Comprehensive interactive XSLT/XPath 1.0/2.0 video G. Ken Holman mailto:gkholman@xxxxxxxxxxxxxxxxxxxx Crane Softwrights Ltd. http://www.CraneSoftwrights.com/s/ Male Cancer Awareness Nov'07 http://www.CraneSoftwrights.com/s/bc Legal business disclaimers: http://www.CraneSoftwrights.com/legal
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