Looping through xml file

Thank you for reading my question.

I have the following xml and xsl files.

There are two things that I would like:

1) add the doc types or whatever I need to do so that it validates at http://validator.w3.org/
2) if the parameter being passed does not have sub elements (i.e. <xsl:if test="subheading1"> ) the page renders fine, otherwise, I get an error saying :

rror Type:
msxml3.dll (0x80004005)
The stylesheet does not contain a document element. The stylesheet may be empty, or it may not be a well-formed XML document.

Here is the code:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="yes" omit-xml-declaration="yes"/>
<xsl:param name="fname" select="'test'"/>
    <xsl:template match="/">
      <ul class="clsMainNav">
            <xsl:for-each select="/navigation/heading">
                <li>
                    <xsl:choose>
                        <xsl:when test="url=$fname">
                            <a href="{normalize-space(url)}"><img src="images/NavArrow.gif"  style="border: none; margin-left: 5px; valign: middle;" alt="-" /><xsl:value-of select="text"/></a>
                      <xsl:if test="subheading1">
                        <ul class="clsSubNav1">
                            <xsl:for-each select="subheading1">
                              <li>
                                  <xsl:choose>
                                    <xsl:when test="urlsub1= $fname">
                                        <a href="{normalize-space(urlsub1)}"><img src="images/NavArrow.gif"  style="border: none; margin-left: 5px; valign: middle;" alt="-" /><xsl:value-of select="textsub1"/></a>
                                    </xsl:when>
                                    <xsl:otherwise>
                                        <a href="{normalize-space(urlsub1)}"><img src="images/NavBlank.gif"  style="border: none; margin-left: 5px; valign: middle;" alt="-" /><xsl:value-of select="textsub1"/></a>
                                    </xsl:otherwise>
                                  </xsl:choose>
                              </li>
                            </xsl:for-each>
                        </ul>
                      </xsl:if>
                  </xsl:when>
                        <xsl:otherwise>
                            <a href="{normalize-space(url)}"><img src="images/NavBlank.gif"  style="border: none; margin-left: 5px; valign: middle;" alt="-" /><xsl:value-of select="text"/></a>
                        </xsl:otherwise>
                    </xsl:choose>
                </li>
            </xsl:for-each>
        </ul>
    </xsl:template>
</xsl:stylesheet>



<?xml version="1.0" encoding="ISO-8859-1"?>
<navigation>
      <heading>
            <text>Home</text>
            <url>index.asp</url>
      </heading>
      <heading>
            <text>About Us</text>
            <url>pages/about.asp</url>
            <subheading1>
                  <textsub1>Mission Statement</textsub1>
                  <urlsub1>pages/missionstatement.asp</urlsub1>
            </subheading1>
            <subheading1>
                  <textsub1>By Laws</textsub1>
                  <urlsub1>pages/bylaws.asp</urlsub1>
            </subheading1>
      </heading>
      <heading>
            <text>Events</text>
            <url>pages/events.asp</url>
      </heading>
      <heading>
            <text>Forum</text>
            <url>pages/forum.asp</url>
      </heading>
      <heading>
            <text>Resources</text>
            <url>pages/resources.asp</url>
            <subheading1>
                  <textsub1>Medieval</textsub1>
                  <urlsub1>pages/medieval.asp</urlsub1>
            </subheading1>
            <subheading1>
                  <textsub1>Renaissance</textsub1>
                  <urlsub1>pages/renaissance.asp</urlsub1>
            </subheading1>
            <subheading1>
                  <textsub1>Baroque</textsub1>
                  <urlsub1>pages/baroque.asp</urlsub1>
            </subheading1>
            <subheading1>
                  <textsub1>18th Century</textsub1>
                  <urlsub1>pages/eighteenthcentury.asp</urlsub1>
            </subheading1>
            <subheading1>
                  <textsub1>19th Century</textsub1>
                  <urlsub1>pages/nineteenthcentury..asp</urlsub1>
            </subheading1>
      </heading>
      <heading>
            <text>Archives</text>
            <url>pages/archives.asp</url>
      </heading>
</navigation>

Thanks again,

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