Re: [xsl] How efficient is DVC? - A grouping example - FIXED

["Robbert van Dalen" <juicer@xxxxxxxxx>]

OK, here come the *complete * working examples.

_____________
Example 1:

Input:

<cities>
 <city name="Barcelona" country="Espana"/>
 <city name="Paris" country="France"/>
 <city name="Roma" country="Italia"/>
 <city name="Madrid" country="Espana"/>
 <city name="Milano" country="Italia"/>
 <city name="Firenze" country="Italia"/>
 <city name="Napoli" country="Italia"/>
 <city name="Lyon" country="France"/>
</cities>

Stylesheet:

 <xsl:template match="cities">
  <xsl:variable name="sorted">
   <xsl:for-each select="./city">
    <xsl:sort select="@country"/>
    <xsl:copy-of select="."/>
   </xsl:for-each>
  </xsl:variable>

  <xsl:variable name="sorted-tree-fragment" select="xalan:nodeset($sorted)/*"/>

 <!-- Gets the groups -->
  <xsl:variable name="groups">
   <xsl:apply-templates select="$sorted-tree-fragment"/>
  </xsl:variable>

 <!-- Iterate through all the groups -->
  <xsl:for-each select="xalan:nodeset($groups)/*">
   <xsl:variable name="country" select="@id"/>
   <xsl:copy>
    <xsl:copy-of select="@*"/>
    <!-- Copy the nodes with the same country -->
    <xsl:copy-of select="$sorted-tree-fragment[@country = $country]"/>
   </xsl:copy>
  </xsl:for-each>
 </xsl:template>

 <xsl:template match="city">
  <xsl:variable name="preceding" select="./preceding-sibling::*[1]"/>
  <xsl:if test="not(./@country = $preceding/@country)">
   <group id="{./@country}"/>
  </xsl:if>
 </xsl:template>

_______________________
Second example:

Input: same input

Stylesheet:

  <xsl:template match="cities">
    <xsl:variable name="sorted">
      <xsl:for-each select="./city">
        <xsl:sort select="@country"/>
        <xsl:copy-of select="."/>
      </xsl:for-each>
    </xsl:variable>

    <xsl:variable name="sorted-tree-fragment"
select="xalan:nodeset($sorted)/*"/>

    <xsl:variable name="groups">
      <xsl:apply-templates select="xalan:nodeset($sorted)/*[1]"/>
    </xsl:variable>

    <xsl:apply-templates select="xalan:nodeset($groups)"/>

  </xsl:template>

  <xsl:template match="city">
    <xsl:variable name="preceding" select="./preceding-sibling::*[1]"/>
    <xsl:choose>
      <xsl:when test="not(./@country = $preceding/@country)">
        <group id="{./@country}">
          <xsl:copy-of select="."/>
          <xsl:apply-templates select="./following-sibling::*[1]"/>
        </group>
      </xsl:when>
      <xsl:otherwise>
        <xsl:copy-of select="."/>
        <xsl:apply-templates select="./following-sibling::*[1]"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>


  <xsl:template match="group">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:copy-of select="./city"/>
    </xsl:copy>
    <xsl:apply-templates select="./group"/>
  </xsl:template>


Robbert.

----- Original Message -----
From: "Mike Brown" <mike@xxxxxxxx>
To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Sunday, March 23, 2003 12:59 AM
Subject: Re: [xsl] How efficient is DVC? - A grouping example - FIXED


> Robbert van Dalen wrote:
> > This is an update on the previous post. I didn't check if the first two
examples
> > worked correctly (I wrote them out of the top of my head). It should now be
> > fixed. Sorry for the inconvenience!
>
> Even with the corrections, the first example is not producing the
> expected output for me. With both Saxon and Xalan, I get
>
> <result>
>    <group id=""/>
>    <group id="Espana">
>       <city name="Barcelona" country="Espana"/>
>       <city name="Madrid" country="Espana"/>
>    </group>
>    <group id="France">
>       <city name="Paris" country="France"/>
>       <city name="Lyon" country="France"/>
>    </group>
> </result>
>
> Can you repost complete, working examples?
>
> Mike
>
> --
>   Mike J. Brown   |  http://skew.org/~mike/resume/
>   Denver, CO, USA |  http://skew.org/xml/
>
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
>
>


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