Comparing previous

Hi all,

I'm hoping someone can help me. Here's my problem:

I am accessing a sorted node list using apply-templates and wish to
compare against the previous node in the sorted node set when accessing
the current node in the matched template. Frankly the penny just hasn't
dropped for me and Xpath, and if it wasn't for M. Kay's book I'd be
lost. I was thinking self::node()[position()-1], but this doesn't seem
to work.

FWIW there are multiple wk_wks nodes and multiple wk_wks_parcel nodes as
children to the wk_wks nodes. wk_wks_parcel nodes may be repeated across
multiple  wk_wks nodes. My goal is to display them all in a list but
only once.

Code snippets follow.
....

            <xsl:apply-templates select="wk_wks/wk_wks_parcel"
mode="permit">
              <xsl:sort select="t_pcl_type"/>
              <xsl:sort select="t_easement"/>
              <xsl:sort select="t_historical"/>
              <xsl:sort select="t_lot"/>
              <xsl:sort select="t_plan"/>
              <xsl:sort select="t_mining"/>
            </xsl:apply-templates>

....
  <xsl:template match="wk_wks_parcel" mode="permit">

    <xsl:choose>
      <xsl:when test="position()=last()">
        <xsl:text> and </xsl:text>
      </xsl:when>
      <xsl:when test="position()!=1">
        <xsl:text>, </xsl:text>
        <xsl:text>(Prev: "</xsl:text>
        <!-- display here now, compare later -->
        <xsl:call-template name="show_works_parcel_text">
          <xsl:with-param name="parcel_node"
select="preceding-sibling::*"/>
        </xsl:call-template>
        <xsl:text>") </xsl:text>
      </xsl:when>
    </xsl:choose>

    <xsl:call-template name="show_works_parcel_text">
      <xsl:with-param name="parcel_node" select="."/>
    </xsl:call-template>
  </xsl:template>

Cheers

Tim Keen
Analyst Programmer
WERD Project
Dept of Natural Resources & Mines
4th Floor, Mineral House
41 George St
Brisbane QLD 4000
(07) 3224 2559 (ph)
(07) 3224 7963 (fax)
tim.keen@xxxxxxxxxxxxxx



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