Copying processing instructions: maybe-bug in Xalan?

[Angus McIntyre]

Given an XML file that contains PHP fragments, I'd like the fragments 
passed through unaltered. My first attempt at writing a stylesheet to 
do this contains the following:

        <xsl:template match="processing-instruction('php')">
                <xsl:copy/>
        </xsl:template>
which seems uncontroversial enough. However, given:
        <?php php_info(); ?>
in the input file, Xalan 2.2D11 spits out:
        <?php php_info(); >
The final '?' has gone away which, to my mind, means that it's no 
longer a valid PI (I haven't yet asked PHP how it feels about it).

Am I doing something wrong? Is Xalan? Should I worry? Is there a 
better way to do this?

Thanks in advance,
        A
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