Re: A challenge.. Group Periods of Data (1..5, 2..8, 4..9) (10..12; 10..

using Dimitre's test file (which has sorted input) here's a simplish
pure xslt1 solution, no node set or other extensions.



<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">


<xsl:output indent="yes"/>

<xsl:template match="A">
<result>
<xsl:apply-templates select="B[1]"/>
</result>
</xsl:template>

<xsl:template match="B">
 <xsl:param name="b" select="@period_begin"/>
 <xsl:param name="e" select="@period_end"/>
 <xsl:param name="g" select="/.."/>
<xsl:variable name="e2" select="@period_end[. &gt; $e]|$e[. &gt;= 
current()/@period_end]"/>
<xsl:choose>
<xsl:when test="../B[(_at_)period_begin &lt;=$e2 and @period_end &gt; $e2]">
 <xsl:apply-templates select="following-sibling::B[1]">
  <xsl:with-param name="b" select="$b"/>
  <xsl:with-param name="e" select="$e2"/>
  <xsl:with-param name="g" select="$g|."/>
 </xsl:apply-templates>
</xsl:when>
  <xsl:otherwise>
  <period begins="{$b}" ends="{$e2}">
    <xsl:copy-of select="$g|."/>
  </period>
 <xsl:apply-templates select="following-sibling::B[1]"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>


</xsl:stylesheet>



<A>
        <B period_begin="1" period_end="5"/>
        <B period_begin="2" period_end="7"/>
        <B period_begin="3" period_end="10"/>
        <B period_begin="4" period_end="12"/>
        <B period_begin="14" period_end="16"/>
        <B period_begin="16" period_end="20"/>
        <B period_begin="16" period_end="30"/>
        <B period_begin="32" period_end="33"/>
        <B period_begin="33" period_end="38"/>
</A>





$ saxon period.xml period.xsl
<?xml version="1.0" encoding="utf-8"?>
<result>
   <period begins="1" ends="12">
      <B period_begin="1" period_end="5"/>
      <B period_begin="2" period_end="7"/>
      <B period_begin="3" period_end="10"/>
      <B period_begin="4" period_end="12"/>
   </period>
   <period begins="14" ends="30">
      <B period_begin="14" period_end="16"/>
      <B period_begin="16" period_end="20"/>
      <B period_begin="16" period_end="30"/>
   </period>
   <period begins="32" ends="38">
      <B period_begin="32" period_end="33"/>
      <B period_begin="33" period_end="38"/>
   </period>
</result>



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