RE: Outputing a node whose value appears only once

Read about Muenchian grouping at http://www.jenitennison.com/xslt/grouping.
You can use the same idea to test whether a value is unique within the file
(a member of a group of one) by defining the grouping key

<xsl:key name="gk" match="b|bb|bbb" use="."/>

and testing a node

<xsl:template match="b|bb|bbb">
  <xsl:if test="not(key('gk', .)[2])">
    The value is unique
  </xsl:if>
</xsl:template>

Michael Kay
http://www.saxonica.com/
 

> -----Original Message-----
> From: Jonathan Marenus [mailto:jonathanmarenus@xxxxxxxxx] 
> Sent: 18 July 2005 23:35
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Outputing a node whose value appears only once
> 
> 
> What I would like to do now is output a value that
> appears only once throughout the XML file. For
> example, if I have:
> 
> <a>
>    <b>value1</b>
>    <bb>value2</bb>
>    <bbb>value3</bbb>
> </a>
> <c>
>    <b>value1</b>
>    <bb>value2</bb>
>    <bbb>value4</bbb>
> </c>
> 
> From the point of view of 'a', I would want to output
> "value3" because 'a' contains it but 'c' does not. 
> This is assuming that the above is the entire file.  I
> also need to output a sibling of the node which does
> not appear more than once (like the value of a/b or
> a/bbb).  It is also assumed that multiple instances of
> the same value will have different parents.  This is
> shown in the example above.
> 
> Thanks for the help.
> 
> Jonathan
> 
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