<?xml version = '1.0' encoding = 'windows-1251'?>
<root>
  <sql>
    <string> select  2 : 1 </string>
  </sql>
  <sql>
    <string> select  2 : 2 </string>
  </sql>
</root>

<?xml version = '1.0' encoding = 'windows-1251'?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" encoding="windows-1251"/>
  <xsl:template match="node()|@*">
    <xsl:copy>
      <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>    
  </xsl:template>
 
  <xsl:template match="sql">
    <xsl:value-of select="position()"/>  
  </xsl:template>
</xsl:stylesheet>

<?xml version = '1.0' encoding = 'windows-1251'?>
<root>
   2 
   4 
</root>

<?xml version = '1.0' encoding = 'windows-1251'?>
<root>
   1 
   2 
</root>

<xsl:template match="sql">
    <xsl:if test="position()=1">
     ........
    </xsl:if>
  </xsl:template>