gistfile1.xml

      <xsl:variable name="clean-context">
         <xsl:for-each select="$ww-context/following-sibling::node()">
            <xsl:choose>
               <xsl:when test="self::text() and normalize-space(.) = ''"/>
               <xsl:otherwise>
                  <xsl:copy-of select="."/>
               </xsl:otherwise>               
            </xsl:choose>
         </xsl:for-each>
      </xsl:variable>