External XSLT processing

Hello, i use Stylus Studio Integration Edition 6.1 built 276.

I have the next xsl (first.xsl)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [<!ENTITY error SYSTEM "error.xsl">]>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output method="html"/>
	<xsl:template match="/">
......
&error;


and the next xsl (error.xsl)

<table>
<tbody>
<tr>
<td><xsl:value-of select="ReqCli/@Type"/></td>
</tr>
</tbody>
</table>

When i define the Scenario i use for debug Xalan-J and it work
correct, i use for debug Saxon and too work correct, when i use
external processing MSXML 4.0 it have an error :

External XSLT processing started...
Error occurred while parsing document.
Code:   0xc00ce01d
.....
Reference to undeclared namespace prefix: 'xsl'.
...done

Why it ocurred ?? i try to include the file xsl inside another xsl.

thnaxs

--
Mazzobel Silvio Guido