Create a node-set from a string parameter?

How can I create a node-set out of a string?  What I currently have isn't
working.  I am getting an XSL exception of "cannot convert to node-set".
Here is a little more information:

I am using XT and I am passing in a String parameter into my stylesheet.  My
code looks like:

String xmlFields =
"<xml><fields><field>001</field><field>012</field><field>018</field></fields
></xml>";
xslProcessor.setParameter("DISP", xmlFields);

My stylesheet looks like:

<?xml version='1.0'?>
<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' 
	xmlns:xt='http://www.jclark.com/xt' version='1.0'>
<xsl:output method='xml' indent='yes'/>
<xsl:param name='DISP'/>
<xsl:variable name='display'
select=\"xt:node-set($DISP)/xml/fields/field\"/>
<xsl:template match='/'>
	<Content><xsl:apply-templates select='//*[@fn=$display]'/>
	</Content>
</xsl:template>
</xsl:stylesheet>

My XML looks like:

<record fn='001'>
<citation fn='003'>001-01-0032</citation>
<name fn='012'>
	<last fn='012'>Jones</last>
	<first fn='012'>Joe</first>
</name>
<city fn='018'>CONCORD</city>
<state fn='018'>NH</state>
<zip.code fn='018'>03301</zip.code>
</record>

The idea is to only act on those elements whose attribute fn matches one of
numbers in the input DISP parameter.  Anyone have any ideas as to what might
be wrong?

Thanks,
Karen


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