Use of macro-argument

I have the following definition in a stylesheet
<xsl:define-macro name="listitem">
  <xsl:macro-arg name="itemtext"/>
  <fo:list-item>
   <fo:list-item-label font-style="italic">
    arg(itemtext)<xsl:text>:</xsl:text>
   </fo:list-item-label>
   <fo:list-item-body>
    <xsl:contents/>
   </fo:list-item-body>
  </fo:list-item>
</xsl:define-macro>

and further down I invoke the macro with:

  <xsl:invoke macro="listitem">
    <xsl:arg name="itemtext" value="To"/>
     <xsl:value-of select="to"/>
  </xsl:invoke>

I would like that the "itemtext" argument (the string "To") 
substitutes 
    {arg(itemtext)}<xsl:text>:</xsl:text>
in the result tree.

However, I cannot seem to find a way to get hold of the
value when the argument is instantiated (I just get the literal
string {arg(itemtext)}). Is there a way to get the actual value
of a macro argument for use as a text string?

Many thanks, Michel Goossens

 


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