[xsl] Need help using variable in select statement

[Frank Stoner <fstoner@xxxxxxx>]

I'm trying to mimic the functionality of a tag used in  
documenting .NET C# code.
The tag identifies a file and path location of xml content to merge  
into the source document.

<include file="content.xml" path="/Top/Child[@name='Me']/*" />

The template that I have written to translate this tag is simply:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/ 
Transform">
    <xsl:template match="include">
        <xsl:variable name="file" select="@file"/>
        <xsl:variable name="path" select="@path"/>
        <xsl:copy-of select="document($file)$path"/>
    </xsl:template>
</xsl:stylesheet>

The problem is that the use of the $path variable in the "select="  
statement seems to violate some syntax rule and all I get is a  
complaint about an unexpected token on that line.

Now if I substitute the variable value "Top/Child[@name='Me']/*" in  
place of the "$path" variable, the template works as expected.

I've tried a number of ways to build the select statement, but none  
have worked out.  Any suggestions?

Thanks,
Frank