xsl:include

One simple thing seems not to work.
I want to include some variables from an
extra stylesheet into another stylesheet.
The one xsl file may look like that:

'variable.xsl':
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:variable name="var">Something</xsl:variable>
<xsl:variable name="var1">Something</xsl:variable>
</xsl:stylesheet>


<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:import href="variable.xsl"/>

<xsl:value-of select="var1"/>
<xsl:value-of select="var2"/>

</xsl:stylesheet>

But it doesn't work. I have to include some variable definitions from
an extern file. How can I include some xsl things into my main xsl file.
xsl:import also didn't work.

Thanx


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