Matching a processing-instruction and copying the node does not produce the correct output: it will be terminated only with '>' rather than the expected '?>'

== Reproduction ==

This PHP example demonstrates the problem:

<?php

$xsld = new DOMDocument();
$xsld->loadXML( <<<EOT
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="ISO-8859-1" indent="no" omit-xml-declaration="yes" media-type="text/html"/>
	<xsl:template match="processing-instruction()">
		<xsl:copy/>
	</xsl:template>
</xsl:stylesheet>

EOT
);

$xh = new XSLTProcessor();
$xh->importStyleSheet( $xsld );

$doc = new DOMDocument();
$doc->loadXML( <<<EOT
<?php some code ?>
<root></root>
EOT
);

echo $xh->transformToXML( $doc );

?>


== Workaround ==

The following workaround is available to handle specific processing instructions.

	<xsl:template match="processing-instruction('php')">
		<xsl:text disable-output-escaping="yes">&lt;?php </xsl:text>
		<xsl:value-of select="." disable-output-escaping='yes'/>
		<xsl:text disable-output-escaping="yes">?></xsl:text>
	</xsl:template>