Re: [xsl] Meunchian Method - Grouping with attributes

["G. Ken Holman" <gkholman at CraneSoftwrights dot com>]

At 2002-01-25 15:56 -0600, Magick, Brian wrote:
>I'm having a tough time grouping on an attribute where I need to get
>only unique values of the domain attribute for each unique technology.

I find double-level grouping is more easily implemented using variables 
than using keys.

I hope the example below helps.

.................... Ken

t:\ftemp>type brian.xml
<?xml version="1.0" encoding="utf-8"?>
<document>
   <products>
     <product>Product1
       <technology domain="xyz">tech1</technology>
       <technology domain="abc">tech1</technology>
       <technology domain="xyz">tech2</technology>
       <technology domain="xxx">tech2</technology>
       <technology domain="xyz">tech3</technology>
     </product>
     <product>Product2
       <technology domain="xyz">tech1</technology>
       <technology domain="abc">tech1</technology>
       <technology domain="zzz">tech2</technology>
       <technology domain="xxx">tech2</technology>
       <technology domain="aaa">tech3</technology>
     </product>
   </products>
</document>

t:\ftemp>type brian.xsl
<?xml version="1.0" encoding="utf-8"?>

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

<xsl:output omit-xml-declaration="yes"/>

<xsl:template match="/">
   <xsl:variable name="technologies" select="//technology"/>
   <xsl:for-each select="$technologies">
     <xsl:if test="generate-id(.)=
                   generate-id($technologies[.=current()])">
       <xsl:value-of select="."/><xsl:text>
</xsl:text>
       <xsl:variable name="domains"
                     select="$technologies[.=current()]/@domain"/>
       <xsl:for-each select="$domains">
         <xsl:if test="generate-id(.)=
                       generate-id($domains[.=current()])">
           <xsl:text>     domain = </xsl:text>
           <xsl:value-of select="."/><xsl:text>
</xsl:text>
         </xsl:if>
       </xsl:for-each>
     </xsl:if>
   </xsl:for-each>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>xt brian.xml brian.xsl
tech1
      domain = xyz
      domain = abc
tech2
      domain = xyz
      domain = xxx
      domain = zzz
tech3
      domain = xyz
      domain = aaa

t:\ftemp>


--
Upcoming: 3-days XSLT/XPath and/or 2-days XSLFO - Feb 18-22, 2002

G. Ken Holman                mailto:gkholman@CraneSoftwrights.com
Crane Softwrights Ltd.         http://www.CraneSoftwrights.com/s/
Box 266, Kars, Ontario CANADA K0A-2E0 +1(613)489-0999 (Fax:-0995)
ISBN 0-13-065196-6                        Definitive XSLT & XPath
ISBN 1-894049-08-X  Practical Transformation Using XSLT and XPath
ISBN 1-894049-07-1               Practical Formatting Using XSLFO
XSL/XML/DSSSL/SGML/OmniMark services, books(electronic, printed),
articles, training(instructor-live,Internet-live,web/CD,licensed)
Next public training:  02-02-11,12,14,15,18,21,03-04,05,06,08,11,
-                                04-08,09,10,12,05-14,15,06-04,07


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list