Re: XSL Processing to avoid repetitions

Hi List.
I was wondering if anyone could help me to filter out data in an XML stream.
(can be xslt 2.0...)

For example, I have
<xml>
      <city>
            <name>Paris</name>
            <person>Paul</person>
      </city>
      <city>
            <name>New-York</name>
            <person>John</person>
      </city>
      <city>
            <name>Paris</name>
            <person>George</person>
      </city>
</xml>

I would like to have an XSL template able to output something like (using <OL> for example) Paris
      Paul
      George
New-York
      John

Actually, all I am able to do is to get
Paris
      Paul
New-York
      John
Paris
      George

With XSLT 2.0 you can use xsl:for-each-group to group the data
<ol>
  <xsl:for-each-group select="/xml/city" group-by="name">
    <li>
      <xsl:value-of select="current-grouping-key()"/>
      <ol>
        <xsl:for-each select="current-group()/person">
          <li><xsl:value-of select="."/></li>
        </xsl:for-each>
      </ol>
    </li>
  </xsl:for-each-group>
</ol>

(please note that the real structure is more complicated, and the filter is to be done on more than one level...)

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/