Root when the current node is part of Parameter Result Tree Fragement/No

Hi all,

I hope I'm not breaking etiquette, but I could not find an answer to this in 
the FAQ or archives.
I have an XML source document like this:

<Objects>
  <Object>
      <Name>Toothbrush</Name>
      <Type>Electric</Type>
      <Colour>White</Type>
  </Object>
  <Object>
     <Name>Soap Dish</Name>
     <Type>Plastic</Type>
     <Colour>Blue</Colour>
  <Object>
</Objects>

I process it with a stylesheet like this:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.1">
<xsl:key name="kObject" match="Object" use="Name"/>
<xsl:param name="ObjectName" />
<xsl:param name="OtherExpr" />

<xsl:template match="/Objects">
  <FoundObject>
      <xsl:apply-templates select="key('kObject', $ObjectName/Name)"/>
  </FoundObject>
</xsl:template>

<xsl:template match="Object">
   <xsl:copy-of select="."/>
   <xsl:apply-templates select="$OtherExpr/ParamColour"/>
</xsl:template>

<xsl:template match="ParamColour">
   <xsl:if test="current() = key('kObject', $ObjectName/Name)/Colour">
        Is the same colour!
   </xsl:if>
</xsl:template>

I process the XML document with this Stylesheet using SAXON 7.8 in Java, and 
I pass a DOMSource object into each of the parameters that looks like the 
following:
For ObjectName Param
<Name>Toothbrush</Name>

For Other Expr Param:
<ParamColour>White</ParamColour>

The problem is that - within the context of the ParamColour matching 
template, the key object doesn't seem to be defined - in fact, even root of 
this context node ( i.e. <xsl:copy-of select="//" /> is only the Parameter 
contents. This makes me very sad.
Is there a keyword or expression I can use to get the originally processed 
document while I am in the context of a node from an RTREEFRAG or external 
parameter nodeset ?
Thanks in advance for your help,
Colin Toal

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