complex xpath problem

hi

i want to print the text based on the "code" param

my xml:

<?xml version="1.0" encoding="UTF-8"?>
<root>
<p>
    <subject topic="1">geography</subject>
</p>
<p>
<text> g1 </text>
</p>      
<p>
<text> g2 </text>
</p>      
<p>
<text> g3 </text>
</p>      
<p>
<text> g4 </text>
</p>      
<p>
<text> g5 </text>
</p>      
<p>
      <subject topic="2">history</subject>
</p>      
<p>
<text> h1 </text>
</p>      
<p>
<text> h2 </text>
</p>      
<p>
<text> h3 </text>
</p>      
<p>
<text> h4 </text>
</p>      
<p>
      <subject topic="3">Business</subject>
</p>      
<p>
<text> b1 </text>
</p>      
<p>
<text>b2 </text>
</p>      
<p>
<text> b3 </text>
</p>      
<p>
<text> b4 </text>
</p>
</root>





xsl:::::::::::::::

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
<xsl:output indent="yes" encoding="UTF-8" />      
<xsl:param name="code">2</xsl:param>

<xsl:template match="/">
<subject>
   <xsl:attribute name="code"><xsl:value-of select="$code"/></xsl:attribute>
    <xsl:for-each select="following::p[subject/@topic = {$code}]">                          <!-- problem only in this XPATH expression- -->
            <xsl:if test="not(subject)">
       <text>
               <xsl:value-of select="."/>
        </text>
              </xsl:if>
    </xsl:for-each>
</subject>

</xsl:template>
</xsl:stylesheet>



the result should look like:  (based on the param "code",the text should be displayed)


as i am passing param "code" value "2",
it should print as:

 <subject   code="2">
  <text>h1</text>
  <text>h2</text>
  <text>h3</text>
  <text>h4</text>
  </subject>

if i pass  param "code" value "1",

 <subject   code="2">
  <text>g1</text>
  <text>g2</text>
  <text>g3</text>
  <text>g4</text>
  <text>g5</text>
  </subject>





Thanks for your reply,


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