xpath and hxp

 data accessor available in html templates are limited to context descendant elements or context attributes

 at present to allow full xpath expression some xslt custom coding is needed

 these are some cases 

 - text nodes

   *html template*
  
   <span id="hxp-contextcustom-myhandler">replace me</span>
  
   *xsl*
  
   <xsl:template name="contextcustom">
    <xsl:param name="blockData" select="''"/>
    <xsl:param name="specName" select="''"/>
    <xsl:choose>
     <xsl:when test="$specName='myhandler'">
      <!-- sample code -->
      <xsl:text>evaluating /comune/@regione: </xsl:text>
      <xsl:value-of select="$hxpdata/comune/@regione"/>
     </xsl:when>  
     ...
    </xsl:choose>
   </xsl:template>
 
 - attribute nodes

   *html template*
  
   <span title="***$hxp_template(inside_attribute)***">hoverme</span>
  
   *xsl*
  
   <xsl:template name="customcontent">
    <xsl:param name="templatedata" select="''"/>
    <xsl:param name="blockData" select="''"/>
    <xsl:choose>
     <xsl:when test="starts-with($templatedata,'inside_attribute')">
      <!-- sample code -->
      <xsl:text>evaluating /comune/@regione: </xsl:text>
      <xsl:value-of select="$hxpdata/comune/@regione"/>
     </xsl:when>
     ...
    </xsl:choose>
   </xsl:template> 

 - as a parameter passed to an id handler

   *html template*

   <span id="hxp-myhandler-$hxp_template(inside_id)">replace me</span>

   *xsl*

   <xsl:template name="contextcustom">
    <xsl:param name="blockData" select="''"/>
    <xsl:param name="specName" select="''"/>
    <xsl:choose>
     <xsl:when test="$specName='myidhandler'">
      <!-- sample code -->
      <xsl:text>evaluating /comune/@regione: </xsl:text>
      <xsl:value-of select="$hxpdata/comune/@regione"/>
     </xsl:when>  
     ...
    </xsl:choose>
   </xsl:template>

   <xsl:template name="myidhandler">
    <xsl:param name="blockData" select="$hxpdata"/>
    <!-- store xpath data in a variable --> 
    <xsl:variable name="myparam">
     <xsl:call-template name="hxpstring">
      <xsl:with-param name="data" select="$blockData" />
      <xsl:with-param name="thestring" select="substring-after(@id,'hxp-myhandler-')"/>
     </xsl:call-template>
    </xsl:variable>
    ...
    <!-- use data -->
    <xsl:value-of select="$myparam"/>
    ...
   </xsl:template>