[xsl] XPath references using exsl:node-set() stop working when default n

Previously working references to nodes stored inside a variable and 
referenced using the exsl:node-set() function are no longer working 
properly since I defined a default name-space for my document.
I'm using XSLT 1.0 and the syntax is as below:

  <xsl:template name="document" match="document">
       ...

       <xsl:variable name="args">
           <local-pub-id><xsl:value-of select="./@pub-id" /></local-pub-id>
           <local-doc-type><xsl:value-of select="./@type" 
/></local-doc-type>
           <element-num><xsl:value-of select="./@element" /></element-num>
       </xsl:variable>

       <xsl:value-of select="exsl:node-set($args)/local-pub-id" />
       ...
  </xsl:template>


It works fine when I take out the default name-space declaration but I 
need to keep that in. I *can* reference the nodes in the variable using 
the form:
   <xsl:value-of select="exsl:node-set($args)[1]" />

But this is also less than desirable. Do I need to put namespace 
declarations in the variable node or similar? Using the libxml2 processor.

Hope you can help,

Matt

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