Indexing ancestors for islandora_collection_search module.

gistfile1.xslt

<!-- In your demoFoxmlToSolr.xslt, do this! -->

<!-- Put this with the rest of your includes -->
<xsl:include href="/path/to/islandora_transforms/hierarchy.xslt"/>

<!-- Then put this in your main template -->
<xsl:variable name="ancestors">
  <xsl:call-template name="get-ancestors">
    <xsl:with-param name="PID" select="/foxml:digitalObject/@PID" />
  </xsl:call-template>
</xsl:variable>

<xsl:for-each select="xalan:nodeset($ancestors)//sparql:obj">
  <xsl:if test="@uri != concat('info:fedora/', $PID)">
    <field name="ancestors_ms"><xsl:value-of select="substring-after(@uri, '/')"/></field>
  </xsl:if>
</xsl:for-each>

Should probably be
<!-- In your foxmlToSolr.xslt, do this! -->

Like with the namespaces, traverse-graph.xslt also needs to be uncommented in foxmlToSolr.xslt.