[xsl] XPath to find first cell in first row of table

I have an XML table like below from which I am constructing a roughly 
matching XSL-FO table, and I need to insert something extra only in the 
first cell of the first row, as indicated:
   <table>
     <title>My title</title>
     <tgroup cols="3">
       <colspec colname="C1" />
       <colspec colname="C2" />
       <colspec colname="C3" />
       <thead>
         <row>
           <entry> text </entry>
           <entry> text </entry>
           <entry> text </entry>
         </row>
       </thead>
       <tbody>
         <row>
           <entry> <!-- insert something extra here only --> text </entry>
           <entry> text </entry>
           <entry> text </entry>
         </row>
         <row>
           <entry> text </entry>
           <entry> text </entry>
           <entry> text </entry>
         </row>
       </tbody>
     </tgroup>
   </table>

There are templates matching each element: table, tbody, row, entry, 
etc. In the <entry> template, how might I check if the current entry is 
the first one in the first row? Or is there a better way?
  <xsl:template match="entry">
    <xsl:if test="MAGICAL XPATH that tells if it's the first cell in 
the first row">
      <fo:block> insert special things </fo:block>
    </xsl:if>
    <fo:block xsl:use-attribute-sets="entry">
      ...
    </fo:block>
  </xsl:template>

Thanks,
Mark
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