[xsl] Re: RE: grouping content

Subject: [xsl] Re: RE: grouping content
From: "Yang" <sfyang@xxxxxxxxxxxxx>
Date: Mon, 9 Apr 2001 09:05:19 +0800

Once again, Jeni presented a complete and clear description how to work out
the grouping problem using xslt.

In this presentation, I would like to point out there are  some typo errors
in missing sign of **)** with concat function and one in using
LocationGroups key name
which is another  typo error of **locs-by-area**.

Following is a complete list of using apply-templates styles for a reference
which has been tested using msxml3.
Hopefully  it helps newbies easily to learn Jeni's technique to solve
grouping problems.

** Group-content.xsl **

  <?xml version="1.0" encoding="iso-8859-1" ?>
- <xsl:stylesheet version="1.0"
  <xsl:key name="locs-by-area" match="Location" use="@Area" />
  <xsl:key name="locs-by-area-and-type" match="Location" use="concat(@Area,
':', @Type)" />
- <xsl:template match="/">
  <xsl:apply-templates select="//US" />
+ <xsl:template match="US">
- <!--  iterate over the Location elements with unique Areas
  <xsl:apply-templates mode="area-group" select="Location[generate-id()
=generate-id(key('locs-by-area', @Area)[1])]" />
- <xsl:template match="Location" mode="area-group">
- <!--  output a line giving the Area
  <xsl:value-of select="@Area" />
  <br />
  <br />
- <!--
 iterate over the Location elements with this Area, but only
        those with unique Types

  <xsl:apply-templates mode="area-and-type-group"
select="key('locs-by-area', @Area)[generate-id()
= generate-id(key('locs-by-area-and-type', concat(@Area, ':', @Type))[1])]"
- <xsl:template match="Location" mode="area-and-type-group">
- <!--  output a line giving the Type
  <xsl:value-of select="@Type" />
  <br />
- <!--
 create a variable to hold the Locations with that Type
        in that Area

  <xsl:variable name="locations" select="key('locs-by-area-and-type',
concat(@Area, ':', @Type))" />
- <!--  apply templates to the location with Rural scope
  <xsl:apply-templates select="$locations[@Scope = 'Rural']" />
- <!--  apply templates to the location with Urban scope
  <xsl:apply-templates select="$locations[@Scope = 'Urban']" />
- <xsl:template match="Location">
  <xsl:value-of select="@Scope" />
  <xsl:value-of select="@value" />
  <br />

Sun-fu Yang


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