Ok that's perfect. Thanks Ken.
-----Original Message-----
From: G. Ken Holman [mailto:gkholman(_at_)CraneSoftwrights(_dot_)com]
Sent: Wednesday, August 20, 2008 2:40 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
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
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