updating a param value for recursion

Hi

Ive tried to look through the archives for a previous example similar to 
my query but I couldnt find any. Hence would appreciate any help.
I have a string of the form '<Value>at1000 First at2000 Second at3000 
Third</Value>'
I would like an output of the form
<Value ref="at1000">First</Value>
<Value ref="at2000">Second</Value>
<Value ref="at3000">Third</Value>

I have written a template for this

<xsl:template name="atCodes">
   <xsl:param name="atStr"/>   <!--receives string of the form 'at1000 
First at2000 Second at3000 Third'-->
   <Value>
       <xsl:attribute name="ref" 
select="substring-before($atStr,$splitString)"/> <!--$splitString = '   '-->
       <xsl:variable name="interim" 
select="normalize-space(substring-after($atStr,$splitString))"/>
       <xsl:value-of select="substring-before($interim,$splitString)"/>
   </Value>
   <xsl:call-template name="atCodes">
          <xsl:with-param name="intem" 
select="substring-after($interim,$splitString)"/>   <!--Generates 
compilation error for $interim-->
      </xsl:call-template>
</xsl:template>

The compiler rightly complains that the '$interim' variable isnt declared.

What Id really like is for the param '$atStr' to be updated in the 
<Value> block. I was thinking of using the replace() function but dont 
know how to implement it in this case.
Suggestions please.

Thanks
Rahil

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