Recursive calls to a named template

Hi,
 Can anyone please give me hint how to copy the previous operations?
 Actually, the input xml file is a dynamic one and the number of 'group'
is arbitrary. The xml source would look like this:

<formatted-xml>
  <group><identifier>a</identifier>
    <signature>signature <identifier>DNSQuery1</identifier>
      <in>in<long>long</long><identifier>ant</identifier></in>
    </signature>
  </group>
  <group><identifier>b</identifier><identifier>a</identifier>
    <signature>signature<identifier>DNSQuery2</identifier>        
       <inout>inout<string>string</string><identifier>grass</identifier>
       </inout>
    </signature>
  </group>
  <group><identifier>c</identifier><identifier>b</identifier>
     <signature>signature<identifier>DNSQuery3</identifier>               
        <out>out<boolean>boolean</boolean>        
                          <identifier>fish</identifier></out>
     </signature>
  </group>
</formatted-xml>

    What I have to do is, I should copy the signature part the first group
identifier 'a' to the signature part in group identifier 'b', because it
is followed by the group identifier 'a'.
    Similarly, the third group identifier 'c' is followed by the second
group identifier 'b' (which should have already copied the 
first group identifier a's signature part) and so the second group
identifier's signature part should be copied to the third group identifier
signature part.

I tried the following xsl.

<xsl:template match="group">
	<xsl:variable name="groupID" select="identifier"/>
	group<xsl:text> </xsl:text><xsl:value-of  
                 select="$groupID"/>Interface {
	<xsl:call-template name="generation"/>	
	<xsl:apply-templates select="generation"/>
	<xsl:apply-templates select="group"/>
	}
</xsl:template>
<xsl:template name="generation" match="signature">
   <!--How the signature part output should look like goes here-->
   <!--Copying the previous group identifier signature part-->
   <xsl:if test="identifier[2]= preceding::group/identifier">
     <xsl:copy>
         <xsl:apply-templates select="preceding::group/signature"/>
      </xsl:copy>
   </xsl:if>
</xsl:template>
 
  Charles Knell suggested that the problem could be resolved by recursive
calls to a named template. As the number of 'group's is arbitrary,I don't
know exactly how to fix this.
 Can anyone show me the right direction?

Thanks and regards,
Ram

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