difference between Saxon 5.5.1 and Xalan 1.2

Hi,

I have this XSLT code that works fine under Xalan 1.2:

 <xsl:variable name="top-page" select="(//page)[1]"/>

 <xsl:template match="page[$top-page = .]">
   ...
 </xsl:template>

However when I run it under Saxon 5.5.1 I get the following error message:

At xsl:template on line 64 of file:/home/ovidiu/src/stylesheet/page-wml.xsl: 
The match pattern in xsl:template may not contain references to variables

Is this a bug in Saxon or an extension of Xalan?

Regards,
-- 
Ovidiu Predescu <ovidiu@xxxxxxxxxx>
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