Convert escaped XML content to a treefrag, and then to a nodeset

Continuing on an earlier problem, I have an XML file that has an element
which will have "escaped" XML content.  David Carlisle helped me
discover the "disable-output-escaping" attribute of "xsl:value-of",
which gives me a valid tree fragment.

Now, I need to convert that tree fragment to a nodeset so I can operate
on it.

I noticed the "xalan:nodeset" (and "exslt:node-set") function.  I assume
this takes a tree fragment and returns a nodeset.

I tried something like this:

--------------------
<xsl:template name="genother">
   <xsl:param name="others"/>
   <gork/>
   <xsl:for-each select="$others">
     <xsl:variable name="keyValue" select="key"/>
     <xsl:variable name="valueFrag">
       <xsl:value-of disable-output-escaping="yes" select="value"/>
     </xsl:variable>
     <xsl:variable name="valueNodes">
       <xsl:value-of select="xalan:nodeset($valueFrag)"/>
     </xsl:variable>
     <xsl:for-each select="$valueNodes">
...
--------------------

The "<gork/>" is just a flag to make sure I got there.

When I run this stylesheet on my XML (using xalanj 2.5.1), I get the
following:

SystemId Unknown; Line #0; Column #0;  XSLT Error
(org.apache.xpath.XPathException): Can not convert #STRING to a
NodeList!


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