xsl:include

Hi there,
How can I use xsl:include if I want something like this:
(If I have an XML called x.xml:
<FileID>
    Something
</FileID>
)
<xsl:stylesheet ....>
  <xsl:variable name="filename" select="//FileID"/>
  <xsl:include href="concat($filename,'.xsl')"/>
..
</xsl:stylesheet>

Looks like I can not do that....

Thanks
Yue


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