"Protocol scheme 'c' is not supported ..."

I have a doc that refers to a DTD like this:

    <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

and the doc's "outer element" is:

    <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"
debug="false">

I'm trying to read the doc with:

    $cxml = XML::XPath->new(filename => $cfile);

and I get this error:

501 Protocol scheme 'c' is not supported c:/dir/subdir/log4j.dtd
Handler couldn't resolve external entity at line 2, column 48, byte 87
error in processing external entity reference at line 2, column 48, byte
87:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
===============================================^

I have XML::XPath version 1.13.  Any help?  Thanks,

-Christopher
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