Hi

i'm trying to build  menu.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet 
  version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:msxml="urn:schemas-microsoft-com:xslt" 
  xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets" 
  exclude-result-prefixes="msxml
 umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes 
Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings 
Exslt.ExsltSets ">


<xsl:output method="xml" omit-xml-declaration="yes" />

<xsl:param name="currentPage"/>

<xsl:variable name="level" select="1"/>

<xsl:template match="/">

<!-- The fun starts here -->
  <ul>
    <li> <a href="/">Start</a></li>
    <xsl:for-each select="$currentPage/ancestor-or-self::* [@isDoc and @level=$level]/* [@isDoc and string(umbracoNaviHide) != '1']">
      <li>
        <a>
          <xsl:attribute name="href">
            <xsl:choose>
              <xsl:when test="count(./*[@isDoc]) = 1">
                <xsl:value-of select="umbraco.library:NiceUrl(./node/@id)" />
              </xsl:when>
              <xsl:otherwise>
                <xsl:value-of select="umbraco.library:NiceUrl(@id)" />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:attribute>
          <xsl:value-of select="menuTitle"/>
        </a>
      </li>
    </xsl:for-each>
  </ul>

</xsl:template>
</xsl:stylesheet>

why after change  "=" to "&gt;" or ">" in line <xsl:when test="count(./*[@isDoc] =1">  i've got error System.OverflowException: Value was either too large or too small for an Int32.?