Where can I find documentation for doing <TMPL_INCLUDE>-type stuff in XML? (Specifically, I'm using XML::Parser under Apache/mod_perl with taint-checking.) Right now, what I have is:

<?xml version="1.0" standalone="no" ?>
<!DOCTYPE pdftemplate [
<!ENTITY footer SYSTEM "./footer.xml">
]>
# ... some XML here, including &footer;
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The error I'm getting is:

Insecure $ENV{PATH} while running with -T switch at /some/path/perl5/5
+.00503/Cwd.pm line 82.
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footer.xml is in the same directory as the main XML file.

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