Dynamic include

Hi
I have three xsl doc:
-principal.xsl
-menu.xsl
-content.xsl

In principal.xsl, I do a xsl:include that includes the two other XSL. 
Now I want to do a dynamic include depending on a tag of  my XML document.
For example:
   xml: <include>page1.xsl<include>
   principal.xsl : <xsl:include><xsl:attribute name="href"><xsl:valueof 
select"include"/></xsl:attribute></xsl:include>
this method is naturally wrong. Any idea?

Thank you for your help
Ced





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