Include with XML?

How I can write an include with a value taken of a XML?



XML:

<PRINCIPAL>
	<LAYER1>layer1.xsl</LAYER1>
	............
</PRINCIPAL>



XSL PRINCIPAL:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:include href="????"/> (¿layer1.xsl?)

<xsl:output method="html" omit-xml-declaration="yes" encoding="ISO-8859-1"/>

<xsl:template match="/">

	..............
	<xsl:call-template name="id_layer"/>
	..............

</xsl:template>

</xsl:stylesheet>



XSL (LAYER1.XSL)

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="html" omit-xml-declaration="yes" encoding="ISO-8859-1"/>


<xsl:template name="id_layer" match="/">

	..............

</xsl:template>

</xsl:stylesheet>




 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list