I have a sequence of nodes stored in a variable,

and I am attempting to filter it using an XPath expression that includes the "except" operator. However, it's not working like I expect it to.
...
I am attempting to filter it using this logic:

<olddata>
<xsl:sequence select="$normalized_data[not(info/@action='delete')] except $normalized_data[info/@action='insert' or info/@action='modify']" />
</olddata>

I expect the returned sequence to include all of the nodes in $normalized_data that match the first condition and don't match the second condition (node 3). What I am actually getting is all of the nodes in $normalized data. Is there something about the "except" operator that I'm not understanding?

T:\ftemp>type james.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="2.0">

<xsl:variable name="normalized_data">
<data id="1">
   <info action="delete" />
   <info action="insert" />
   <stuff />
</data>
<data id="2">
   <info action="insert" />
   <stuff />
</data>
<data id="3">
   <stuff />
</data>
</xsl:variable>

<xsl:variable name="normalized_data_ken" as="element(data)+">
<data id="1">
   <info action="delete" />
   <info action="insert" />
   <stuff />
</data>
<data id="2">
   <info action="insert" />
   <stuff />
</data>
<data id="3">
   <stuff />
</data>
</xsl:variable>

</xsl:stylesheet>
T:\ftemp>call xslt2 james.xsl james.xsl james.xml

T:\ftemp>type james.xml
<?xml version="1.0" encoding="UTF-8"?>
<results>
   <james>
      <olddata>
         <data id="1">
            <info action="delete"/>
            <info action="insert"/>
            <stuff/>
         </data>
         <data id="2">
            <info action="insert"/>
            <stuff/>
         </data>
         <data id="3">
            <stuff/>
         </data>
      </olddata>
   </james>
   <ken>
      <data id="3">
         <stuff/>
      </data>
   </ken>
</results>
T:\ftemp>rem Done!

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