Re: A challenge.. Group Periods of Data (1..5, 2..8,

> David, I found a bug.

Supported software has bugs.
Free software picked up off mailing lists only has unexpected features.


> Given:
> 
> <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="15" period_end="16"/>
>   <B period_begin="52" period_end="62"/>
> </A>
> 

> Expected Result is:
> <result>
>   <period begins="1" ends="12" /> 
>   <period begins="14" ends="16" /> 
>   <period begins="52" ends="62" /> 
>   <period begins="63" ends="150" /> 
> </result>
> 
> Any ideas?
>

I wouldn't expect that last group from that input:-)


<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="following-sibling::B[@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>


$ 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="16">
      <B period_begin="14" period_end="16"/>
      <B period_begin="15" period_end="16"/>
   </period>
   <period begins="52" ends="62">
      <B period_begin="52" period_end="62"/>
   </period>
</result>



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