Processing an XML file with a DTD in it

I have an XML file that look somewhat like:

<?xml version="1.0"?>
<!DOCTYPE mydoc2 PUBLIC "mydoc2.dtd"
"http://www.wapforum.org/DTD/wml_1.2.xml">
<months>
  <month id="1">January</month>
  <month id="2">February</month>
  <month id="3">March</month>
  <month id="7">July</month>
</months>

When I view the above file in, say, IE, it
seems happy to dipslay it.  But,  when I try 
a simple transform to get an XML without 
the DTD:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  >
<xsl:template match="/">
  <xsl:apply-templates />
</xsl:template>
<xsl:template match="@*|node()" priority="-1">
  <xsl:copy>
    <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
</xsl:template>
</xsl:stylesheet>

I get back a "null" result:
<?xml version="1.0" encoding="ISO-8859-1"?>

How do I work with such XML files?

Thanks
Derek


-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
MailScanner thanks transtec Computers for their support.