Re: Build unique nodeset when Key can't be used?

I have a <paragraph> element that can contain one or more <link> elements. Each <link> has a @type and a @id attributes. When @type='Figure' the link is to an image. I want to output each <paragraph>, followed by a list of pictures referenced in the <paragraph>.
...
How can I get a list with just one entry for each image? I can't see how to you key, because key is a root-level element and so can't work with just the current <paragraph>. I have tried for-each but can't come up with a select that returns a 'unique' node-set.

T:\chris>type chris.xml
<?xml version="1.0" encoding="utf-8"?>
<book>
  <para>
    <link type="Figure" id="fig1"/>
    <link type="Figure" id="fig2"/>
    <link type="Figure" id="fig1"/>
  </para>
  <para>
    <link type="Figure" id="fig1"/>
    <link type="Figure" id="fig3"/>
    <link type="Figure" id="fig5"/>
  </para>
  <para>
    <link type="Figure" id="fig4"/>
    <link type="Figure" id="fig2"/>
    <link type="Figure" id="fig2"/>
  </para>
</book>
T:\chris>type chris.xsl
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns="http://www.w3.org/1999/XSL/Format"
                version="1.0">

<xsl:template match="/">
  <xsl:apply-templates select="//para"/>
</xsl:template>

<xsl:template match="para">
  <xsl:text/>Paragraph summary:
<xsl:text/>
  <xsl:variable name="figs" select="link[@type='Figure']"/>
  <xsl:for-each select="$figs">
    <xsl:sort select="@id"/>
    <xsl:variable name="figure-id" select="@id"/>
    <xsl:if test="generate-id(.)=
                  generate-id($figs[@id=$figure-id])">
      <xsl:text>Figure id: </xsl:text>
      <xsl:value-of select="$figure-id"/>
      <xsl:text> - </xsl:text>
      <xsl:value-of select="count($figs[@id=$figure-id])"/>
      <xsl:text> time</xsl:text>
      <xsl:if test="count($figs[@id=$figure-id])>1">
        <xsl:text>s</xsl:text>
      </xsl:if>
      <xsl:text>
</xsl:text>
    </xsl:if>
  </xsl:for-each>
</xsl:template>

T:\chris>xt chris.xml chris.xsl
Paragraph summary:
Figure id: fig1 - 2 times
Figure id: fig2 - 1 time
Paragraph summary:
Figure id: fig1 - 1 time
Figure id: fig3 - 1 time
Figure id: fig5 - 1 time
Paragraph summary:
Figure id: fig2 - 2 times
Figure id: fig4 - 1 time

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