Re: Indexing Tree Elements

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

At 00/08/17 10:14 +0100, Lee Goddard wrote:
><xsl:if test="not(@foo = preceding-sibling::*[@foo][1]/@foo)">
>
>to only reveal certain content if it is there is a difference
>between attribute values found in the node immediately preceeding
>the current node.
>
>It seemed to work for a while, but now seems to show the value of
>the first node's attribute.

Right ... because there are no preceding-siblings, the comparison of @foo 
would be false, so the negation would be true.

Would the following do what you wish?

     <xsl:if test="preceding-sibling::*[@foo] and
                   not(@foo = preceding-sibling::*[@foo][1]/@foo)">

Attached below is an example ... I hope this helps.

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

T:\ftemp>type goddard.xml
<?xml version="1.0"?>
<doc>
  <test foo="a" item="1"/>
  <test foo="b" item="2"/>
  <test foo="b" item="3"/>
  <test foo="c" item="4"/>
  <test foo="d" item="5"/>
  <test foo="d" item="6"/>
</doc>
T:\ftemp>type goddard1.xsl
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 version="1.0">

<xsl:template match="/">                         <!--root rule-->
   <xsl:for-each select="//test">
     <xsl:if test="not(@foo = preceding-sibling::*[@foo][1]/@foo)">
Found: <xsl:value-of select="@foo"/> in <xsl:value-of
                                                   select="@item"/>
     </xsl:if>
   </xsl:for-each>
</xsl:template>

</xsl:stylesheet>


T:\ftemp>xt goddard.xml goddard1.xsl
<?xml version="1.0" encoding="utf-8"?>

Found: a in 1
Found: b in 2
Found: c in 4
Found: d in 5
T:\ftemp>type goddard2.xsl
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 version="1.0">

<xsl:template match="/">                         <!--root rule-->
   <xsl:for-each select="//test">
     <xsl:if test="preceding-sibling::*[@foo] and
                   not(@foo = preceding-sibling::*[@foo][1]/@foo)">
Found: <xsl:value-of select="@foo"/> in <xsl:value-of
                                                   select="@item"/>
     </xsl:if>
   </xsl:for-each>
</xsl:template>

</xsl:stylesheet>


T:\ftemp>xt goddard.xml goddard2.xsl
<?xml version="1.0" encoding="utf-8"?>

Found: b in 2
Found: c in 4
Found: d in 5
T:\ftemp>rem


--
G. Ken Holman                    mailto:gkholman@CraneSoftwrights.com
Crane Softwrights Ltd.             http://www.CraneSoftwrights.com/s/
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