How do I get a new DITA tag to carry over to my output using XSLT? - xslt

Question

I had successfully updated my XSLT to script to add the audience tag to my output but I was asked for the output to display slightly differently.
My original input looked like this:
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE bookmap PUBLIC "-//OASIS//DTD DITA BookMap//EN" "bookmap.dtd" []>
<bookmap>
<topicgroup>
<topichead navtitle="Arkansas Property and Casualty Adjuster Law" locktitle="yes" audience="Arkansas">
<topicgroup>
<mapref href="Qbank/maps/Adj_Unit_AR.ditamap" format="ditamap"/>
</topicgroup>
</topichead>
</topicgroup>
</bookmap>
The portion of my original script looked like this:
<xsl:template match="*[contains(#class,' mapgroup-d/topichead ')]">
<topichead>
<xsl:attribute name="navtitle">
<xsl:value-of select="#navtitle"/>
</xsl:attribute>
<xsl:choose>
<xsl:when test="#audience">
<xsl:attribute name="audience">
<xsl:value-of select="#audience"/>
</xsl:attribute>
</xsl:when>
<xsl:otherwise />
</xsl:choose>
</topichead>
</template>
But now I'm being asked to move the audience tag to a different spot and I'm having trouble getting the transform to grab the tag.
My new input looks like this:
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE bookmap PUBLIC "-//OASIS//DTD DITA BookMap//EN" "bookmap.dtd" []>
<bookmap>
<chapter navtitle="Alabama Property and Casualty Adjuster Law" locktitle="yes" audience="Alabama">
<topicgroup
<topicgroup>
<mapref href="Qbank/maps/Adj_Unit_AL.ditamap" format="ditamap"/>
</topicgroup>
</topicgroup>
</chapter>
</bookmap>
This is the script I tried but it's not pulling over the audience tag.
<xsl:template match="*[contains(#class,' mapgroup-d/topichead ')]">
<topichead>
<xsl:attribute name="navtitle">
<xsl:value-of select="#navtitle"/>
</xsl:attribute>
<xsl:choose>
<xsl:when test="bookmap/chapter/#audience">
<xsl:attribute name="audience">
<xsl:value-of select="#audience"/>
</xsl:attribute>
</xsl:when>
<xsl:otherwise />
</xsl:choose>
</topichead>
</template>
What am I doing wrong?

Answer 1

This xsl:when expression:
<xsl:when test="bookmap/chapter/#audience">
is a relative xpath, meaning that the XSLT processor searches for an element "bookmap" which is a child of the current "topichead" element matched by the xsl:message. You need to search upwards, something like:
<xsl:when test="ancestor::chapter/#audience">
Then this value-of:
<xsl:value-of select="#audience"/>
it's a relative xpath expression again, relative to the current "topichead" element matched by the xsl:template. So you would probably need to replace it with:
<xsl:value-of select="ancestor::chapter/#audience">

Answer 2

In addition to the answer of #Radu Coravu:
A bit shorter would be
instead of:
<xsl:choose>
<xsl:when test="ancestor::chapter/#audience">
<xsl:attribute name="audience">
<xsl:value-of select="ancestor::chapter/#audience"/>
</xsl:attribute>
</xsl:when>
<xsl:otherwise />
</xsl:choose>
just use:
<xsl:copy-of select="ancestor::chapter/#audience"/>