XML : XSLT with namespace in root element

I've been tinkering with this for too long and can't seem to find the answer anywhere -- or perhaps I don't know how to word the questions.

I have an XML file that represents a sitemap.

  <?xml version="1.0" encoding="UTF-8"?>  <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">     <url>        <loc>http://...</loc>        <pagetitle>English</pagetitle>        <children>           <url>              <loc>http://...</loc>              <pagetitle>page title</pagetitle>           </url>           <children>              ...    

This XML represents a site map. I have written an XSLT to turn this into a hierarchical list.

  <?xml version="1.0" encoding="UTF-8"?>    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">        <xsl:output method="html" indent="yes" version="4.0"/>        <xsl:template match="/">         <ul><xsl:apply-templates /></ul>      </xsl:template>        <xsl:template match="url">          <li><a href="{loc}"><xsl:value-of select="pagetitle"/></a></li>          <xsl:apply-templates select="children"/>      </xsl:template>        <xsl:template match="children">          <ul><xsl:apply-templates select="url"/></ul>      </xsl:template>    </xsl:stylesheet>    

This style sheet doesn't work when I have , but if I change the node to use just (without the attribute) it works.

I am far from an XSLT guru. Anyone have a suggestion?