<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

   <xsl:template match="mainline_version">

      <xsl:apply-templates select="document(concat($XML, '/versions.xml'))                 /versions/download[@tag='mainline'][1]/item[1]/@ver"/>
   </xsl:template>

   <xsl:template match="stable_version">

      <xsl:apply-templates select="document(concat($XML, '/versions.xml'))                 /versions/download[@tag='stable'][1]/item[1]/@ver"/>
   </xsl:template>

   <xsl:template match="commercial_version">

      <a href="http://nginx.com/products/">commercial subscription</a>
   </xsl:template>

</xsl:stylesheet>