Hi, I have an Umbraco V4 website and I have created a couple of Ultimate picker datatypes based on childs of the the following nodes (Locations and Categories):

Locations
      - Location A
      - Location B
      - Location C

Categories
      - Category A
      - Category B
      - Category C

The Locations Ultimate picker datatype is a dropdown list and the Catergories Ultimate picker datatype is a checkbox list where multiple selections can be selected. These two datatypes are included on a Document type called "Job". I have created a search based on Location and Categories that passes a query string to my search results page. I am having trouble displaying results when a Category is selected because I am not sure how I check whether the Category is selected in XSLT. So far I have the following XSLT, can anyone see what I am doing wrong?

<!-- GET CATEGORY QUERY STRING -->
<xsl:variable name="categoryquery">
<xsl:choose>
        <xsl:when test="umbraco.library:Request('category') &lt;= 0 or string(umbraco.library:Request('category')) = '' or string(umbraco.library:Request('category')) = 'NaN'">0</xsl:when>
        <xsl:otherwise>
                <xsl:value-of select="umbraco.library:Request('category')"/>
        </xsl:otherwise>
</xsl:choose>
</xsl:variable>

<!-- GET LOCATION QUERY STRING -->
<xsl:variable name="locationquery">
<xsl:choose>
        <xsl:when test="umbraco.library:Request('location') &lt;= 0 or string(umbraco.library:Request('location')) = '' or string(umbraco.library:Request('location')) = 'NaN'">0</xsl:when>
        <xsl:otherwise>
                <xsl:value-of select="umbraco.library:Request('location')"/>
        </xsl:otherwise>
</xsl:choose>
</xsl:variable>

<xsl:for-each select="umbraco.library:GetXmlNodeById(1148)/node [string(data [@alias='umbracoNaviHide']) != '1' and contains(data [@alias='category'], $categoryquery) and string(data [@alias='location']) = $locationquery]"> 
  
  <xsl:call-template name="displayResults">
  </xsl:call-template> 
  
</xsl:for-each>