Re: Indexing Tree Elements

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

At 00/07/07 13:14 +0100, David Carlisle wrote:
> > is it possible that it may compare its attributes with the attributes
> > of the previous document-tree node of the same level?
>
><xsl:if test="@foo = preceding-sibling::*/@foo">
>  'tis the same
></xsl:if>

I'm sorry if this sounds pedantic, but because the second argument is a 
node list, the above expression will be true if *any* of the preceding 
siblings nodes has an attribute named "foo" of the equal value.

To check the immediately preceding element for an attribute named "foo", I 
would think one would use:

   <xsl:if test="@foo = preceding-sibling::*[1]/@foo">

To check the the closest (in proximity) preceding element with an attribute 
named "foo", I would think one would use:

   <xsl:if test="@foo = preceding-sibling::*[@foo][1]/@foo">

I hope this helps and is considered constructive.

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


T:\ftemp>type foo.xsl
<?xml version="1.0"?><!--foo.xsl-->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 version="1.0">

<xsl:template match="/">                         <!--root rule-->
   <xsl:for-each select="//test[last()]">
@foo = preceding-sibling::*/@foo: <xsl:choose>
     <xsl:when test="@foo = preceding-sibling::*/@foo">
       <xsl:text>yes</xsl:text>
     </xsl:when>
     <xsl:otherwise>no</xsl:otherwise>
   </xsl:choose>
@foo = preceding-sibling::*[1]/@foo: <xsl:choose>
     <xsl:when test="@foo = preceding-sibling::*[1]/@foo">
       <xsl:text>yes</xsl:text>
     </xsl:when>
     <xsl:otherwise>no</xsl:otherwise>
   </xsl:choose>
@foo = preceding-sibling::*[@foo][1]/@foo: <xsl:choose>
     <xsl:when test="@foo = preceding-sibling::*[@foo][1]/@foo">
       <xsl:text>yes</xsl:text>
     </xsl:when>
     <xsl:otherwise>no</xsl:otherwise>
   </xsl:choose>
   <xsl:text> (</xsl:text>
   <xsl:value-of select="preceding-sibling::*[@foo][1]/@foo"/>
   <xsl:text>)</xsl:text>
   </xsl:for-each>
</xsl:template>

</xsl:stylesheet>


T:\ftemp>type foo.xml
<?xml version="1.0"?>
<doc>
  <test foo="x">a</test>
  <test foo="y">b</test>
  <test        >c</test>
  <test foo="z">d</test>
  <test        >e</test>
  <test foo="x">f</test>
</doc>
T:\ftemp>xt foo.xml foo.xsl
<?xml version="1.0" encoding="utf-8"?>

@foo = preceding-sibling::*/@foo: yes
@foo = preceding-sibling::*[1]/@foo: no
@foo = preceding-sibling::*[@foo][1]/@foo: no (z)
T:\ftemp>rem


--
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)
Web site: XSL/XML/DSSSL/SGML services, training, libraries, products.
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-                                    2000-10-05,2000-11-13,2001-01-27


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