Variables and command line params

Hi

I want to pass a second filename as a parameter from the command line.


The below variable declaration works in my stylesheet when the filename
is hardcoded.

<xsl:variable name="list2" select="doc('filename.xml')//supp"/>

But when I change to...

<xsl:variable name="list2" select="doc($filename)//supp"/>

...and add

		filename="filename.xml"

to the command line option, I get an error - $filename has not been
declared.

Can someone please point out what I am doing wrong.

Thanks.

--
Kevin