Diving into XML - Errors

[Technosailor]

Ok, so I thought I'd dabble my feet in XML with PHP tonight. Very simple thing I'm trying to do. Get the latest version of some software.

I wrote the following DTD and called it sketchpadcopyright.dtd:

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT copyright (currentversion)>
<!ELEMENT currentversion (#PCDATA)>

Then I wrote this XML file called sketchpadcopyright.xml:

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="http://www.emmense.com/xmlfeed/sketchpadcopyright.xsl"?>
<!DOCTYPE copyright SYSTEM "http://www.emmense.com/xmlfeed/sketchpadcopyright.dtd">
<copyright>
	<currentversion>0.1</currentversion>
</copyright>

And the following XSL stylesheet called sketchpadcopyright.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" encoding="utf-8"
   doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
   doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" />
<xsl:template match="/copyright">
	<p>
	<xsl:value-of select="currentversion"></xsl:value-of>
	</p>
</xsl:template>
</xsl:stylesheet>

and followed some code I found in one of KEvin's articles:

<?php
$xsltproc = xslt_create();
$html= xslt_process($xsltproc,'sketchpadcopyright.xml','sketchpadcopyright.xsl');
if(!$html) 
    {
    exit(xslt_error($xsltproc));
    }
xslt_free($xsltproc);
echo $html;
?>

And I can't figure out why I'm getting this error:

Warning: Sablotron error on line 1: XML parser error 4: not well-formed (invalid token) in /home/sketch/public_html/xmlfeed/sketchpadcopyright.php on line 3
XML parser error 4: not well-formed (invalid token)

(http://www.emmense.com/xmlfeed/sketchpadcopyright.php)

What gives? :\

[Technosailor]

There's always XMLers around except when I need one.

[HarryF]

One thing that isn't right is in the DTD file;

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT copyright (currentversion)>
<!ELEMENT currentversion (#PCDATA)>

There shouldn't be an XML processing instruction at the start so it should be;

<!ELEMENT copyright (currentversion)>
<!ELEMENT currentversion (#PCDATA)>

Not sure if that's your problem though.