Variable import or include

Anyone knows how i can import or include a xslt stylesheet with
variable URI?

Example:

The value of the param "variable_uri" it's variable.

(index.xml)

<?xml version="1.0" encoding="ISO-8859-1"?>
<?xslt-param name="variable_uri"  value="some_uri.xslt"?>
<?xml-stylesheet type="text/xsl" href="SomeXSLT.xslt" ?>

<i:Page xmlns:i="http://www.innox.net/i" />

(other_page.xml)

<?xml version="1.0" encoding="ISO-8859-1"?>
<?xslt-param name="variable_uri"  value="another_uri.xslt"?>
<?xml-stylesheet type="text/xsl" href="SomeXSLT.xslt" ?>

<i:Page xmlns:i="http://www.innox.net/i" />

(SomeXSLT.xslt)

<?xml version="1.0" encoding="ISO-8859-1" ?>

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="html" />

<!-- include variable xslt ??? -->
<xsl:include href="..." ???

...
</xsl:stylesheet>

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