external DTD w/ saxon 7.5

Hello,

I use saxon 7.5 under WinXP to process xslt2
Here is a sample doc
        <?xml version='1.0' encoding='ISO-8859-1'?>
        <!DOCTYPE doc SYSTEM "c:/documents/dml/dml.DTD" >
        <doc>
                text
                &biblio;
        </doc>
processing is aborted because c:/documents/dml/dml.DTD cannot be found. 
But c:/documents/dml/dml.DTD is the right path. So what should I do?
I had no problem w/ msxsl, but I need the regex support of xslt2.

--
+----------------------------+
|Nicolas Mazziotta           |
|Aspirant au doctorat        |
|Linguistique française      |
|Département d'études romanes|
|Université de Liège         |
+----------------------------+
|04/3665382                  |
|nicolas(_dot_)mazziotta(_at_)ulg(_dot_)ac(_dot_)be |
+----------------------------+


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