xsl:include of a variable file

Hi,

I need to include one xsl in another based on a variable (which happens to be 
the name of the xsl I wish to include). 

<xsl:include href="$something"/>

does not seem to work, although <xsl:value-of select="$something"/> does output 
the correct filename. what is the right way to do this? I assume I am 
misunderstanding how to use the variable.

thanks in advance.
Jo

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