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Matt Mags

Subject: Problem getting only a single node and need an ELSE structure
Author: Matt Mags
Date: 14 Aug 2007 08:49 AM
Originally Posted: 14 Aug 2007 08:37 AM

How can I say grab the first instance of node X and only the first instance BUT if there are no node X's, grab the first instance of node Y and only the first?

Basically we want to work on the first nodes of whatever path exists and has "highest priority." Here highest priority is a predefined chain in which we work with the data.

So it would be work the first node of type A. If A[1] doesn't have all the attributes required, try A[2], then A[x]. If NONE of the A's have the right attributes, try node B[x] until we find one that satisfies the requirements.

I'm not very good with XSLT so this is kind of driving me crazy

Thanks

James Durning

Subject: Problem getting only a single node and need an ELSE structure
Author: James Durning
Date: 14 Aug 2007 12:06 PM

This is done by using a choose-when-otherwise clause:

<xsl:choose>
<xsl:when test="X"><xsl:value-of select="X[1]"/></xsl:when>
<xsl:otherwise><xsl:value-of select="Y[1]"/></xsl:when>
</xsl:choose>

....
<xsl:choose>
<xsl:when test="X[@attribute1='value1'][@attr2='value2']...[@attr99='value99']">
<xsl:value-of select="X[@attribute1='value1'][@attr2='value2']...[@attr99='value99'][1]">
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="Y[@attribute1='value1'][@attr2='value2']...[@attr99='value99'][1]">
</xsl:otherwise>
</xsl:choose>

Not sure if this is what you're looking for, but hopefully it gives you the right ideas.

Tony Lavinio

Subject: Problem getting only a single node and need an ELSE structure
Author: Tony Lavinio
Date: 14 Aug 2007 07:40 PM

In XSLT 2, it's very simple:
(A|B)[1]

To give a more concrete example, for the XML
<root>
<A x="1"/>
<A x="2"/>
<B x="1"/>
<B x="2"/>
<B x="3"/>
</root>

assuming your context were /root, this would find the first
A that had its @x attribute set to "3", or, failing that, the
first B that had its @x attribute set to "3".
(A[@x="3"]|B[@x="3"])[1]

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