using variable in xsl:include ?

Hi,

is it possible to use a variable in xsl:include like e.g. 
<xsl:variable name="home_directory"
select="document('../../XML/config.xml')//iese.config:home_directory"/>
<xsl:include
href="concat('file://',$home_directory,'class/Person/XSL/person_short.xs
l')"/>

This example does not work! Does anyone know why? The parser says
something like wrong syntax for pathnames,... Any suggestions?

Best regards,
Nick


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