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Re: best-technique for selective group and merge?

Subject: Re: best-technique for selective group and merge?
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 02 Mar 2004 12:44:36 -0500
washington id template
At 2004-03-02 08:43 -0800, James A. Robinson wrote:
The feature can contain multiple configs,
each of which I want to merge across features:
I want to be able to select /config_datastore/site/* and perform selective
grouping (on feature @name) and merging (on the feature/config elements)
to return:

I found I could wrap my head around this problem using variables instead of keys. An example is below giving your desired results. Note how I take advantage of the node-set comparison of a single value to a set of values to get from all configs only those whose feature's name is in a set of names.

I hope this helps.

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

T:\ftemp>type jim.xml <?xml version="1.0"?> <config_datastore> <feature name="a"> <config id="1"> <param id="x">x</param> </config> <config id="2"> <param id="xx">xx</param> </config> <config id="3"> <param id="xxx">xxx</param> </config> </feature> <feature name="b"> <config id="1"> <param id="y">y</param> </config> <config id="2"> <param id="yy">yy</param> </config> </feature> <feature name="c"> <config id="1"> <param id="z">z</param> </config> <config id="2"> <param id="zz">zz</param> </config> </feature> <site> <has_feature name="a"/> <has_feature name="c"/> </site> </config_datastore>

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

<xsl:output indent="yes"/>

<xsl:template match="/">
    <xsl:variable name="configs"
    <xsl:for-each select="$configs">
      <xsl:if test="generate-id(.)=
        <config id="{@id}">
          <xsl:copy-of select="$configs[@id=current()/@id]/*"/>

T:\ftemp>saxon jim.xml jim.xsl
<?xml version="1.0" encoding="utf-8"?>
   <config id="1">
      <param id="x">x</param>
      <param id="z">z</param>
   <config id="2">
      <param id="xx">xx</param>
      <param id="zz">zz</param>
   <config id="3">
      <param id="xxx">xxx</param>
T:\ftemp>rem Done!

US XSL training: Washington,DC March 15; San Francisco,CA March 22
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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)
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