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RE: [xsl] Re: Multi-level grouping using variables

Subject: RE: [xsl] Re: Multi-level grouping using variables
From: kakridge@xxxxxxxxxxxxx
Date: Sat, 10 Jan 2004 23:42:06 -0500

Ken, thank you very much for your help.  I had not seen this way of
grouping before.  I would love to attend one of your training seminars,
but at this time I am working for a small company with limited
resources.  For now I might buy one of your books though :).

Thanks again,
Kenny Akridge

-----Original Message-----
From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx
[mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of G. Ken
Sent: Saturday, January 10, 2004 9:23 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: [xsl] Re: Multi-level grouping using variables

At 2004-01-09 18:17 -0500, kakridge@xxxxxxxxxxxxx wrote:
>I have been having a problem with grouping.  If I have:
>How can I group each grade, and within each grade, group all tutors
>their students?

By using variables and multi-level grouping.  This allows you to easily 
detect groups in a subset scope of the document ... the Muenchian method

works with document-wide scope.  Note how the principles are similar,
but I 
came up with the variable-based approach for a customer who needed three

levels of grouping and the Muenchian method for that deep a level was 
getting very complex to maintain and understand.

An example is below.

I hope this helps.

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

p.s. in our hands-on training we teach all of axis-, variable- and 
key-based grouping methods for XSLT 1.0 (the Muenchian method is the 
key-based method) ... we've just rescheduled our Washington course to
15-19 ... announcements will be made soon, details on our home page ... 
other cities are also being planned so check for a location near you.

t:\ftemp>type kakridge.xml
                                 <Tutor>Mary Smith</Tutor>
                                 <Tutor>Mike Smith</Tutor>
                                 <Tutor>Mary Smith</Tutor>
                                 <Tutor>Mary Smith</Tutor>
                                 <Tutor>Mike Smith</Tutor>

t:\ftemp>type kakridge.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

<xsl:output method="text"/>

<xsl:template match="/">
   <xsl:for-each select="/School/Grade">
     <xsl:variable name="students" select="Students/Student"/>
     <xsl:for-each select="$students">
       <xsl:if test="generate-id(.)=
Grade: <xsl:value-of select="../../Name"/>
Tutor: <xsl:value-of select="Tutor"/>
Students: <xsl:for-each select="$students[Tutor=current()/Tutor]">
             <xsl:if test="position()>1">,</xsl:if>
             <xsl:value-of select="Name"/>


t:\ftemp>saxon kakridge.xml kakridge.xsl

Grade: Kindergarten
Tutor: Mary Smith
Students: Bob,Ken

Grade: Kindergarten
Tutor: Mike Smith
Students: Joe

Grade: First
Tutor: Mary Smith
Students: Ted

Grade: First
Tutor: Mike Smith
Students: Sammy

t:\ftemp>rem Done

North America (Washington, DC): 3-day XSLT/2-day XSL-FO 2004-03-15
Instructor-led on-site corporate, government & user group training
for XSLT and XSL-FO world-wide:  please contact us for the details

G. Ken Holman                 mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.          http://www.CraneSoftwrights.com/s/
Box 266, Kars, Ontario CANADA K0A-2E0    +1(613)489-0999 (F:-0995)
ISBN 0-13-065196-6                       Definitive XSLT and XPath
ISBN 0-13-140374-5                               Definitive XSL-FO
ISBN 1-894049-08-X   Practical Transformation Using XSLT and XPath
ISBN 1-894049-11-X               Practical Formatting Using XSL-FO
Member of the XML Guild of Practitioners:     http://XMLGuild.info
Male Breast Cancer Awareness  http://www.CraneSoftwrights.com/s/bc

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