Re: [xsl] Finding Unique Nodes

[Peter Davis <pdavis152 at attbi dot com>]

On Monday 01 April 2002 23:45, Ivan Pedruzzi wrote:
> > -----Original Message-----
> > From: owner-xsl-list@lists.mulberrytech.com
> > [mailto:owner-xsl-list@lists.mulberrytech.com] On Behalf Of
> > Peter Davis
> > Sent: Tuesday, April 02, 2002 1:25 AM
> > To: xsl-list@lists.mulberrytech.com
> > Subject: Re: [xsl] Finding Unique Nodes
> >
> > On Monday 01 April 2002 21:04, Ivan Pedruzzi wrote:
> > > <?xml version="1.0" encoding="UTF-8"?>
> > > <xsl:stylesheet version="1.0"
> > > xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
> > > <xsl:output method="xml"/>
> > >   <xsl:template match="/">
> > >     <list>
> > >     <xsl:for-each select="list/item">
> > >     <xsl:sort select="list/item"/>
> >
> > This sort requires that "/list/item/list/item" exists, "list/item" is
> > relative to the "list/item" that was selected in the
> > for-each.  To do what I
> > think you are trying to do, you want:
> >
> > <xsl:sort select="."/>
> >
> > >           <xsl:if test="not(following-sibling::item = .)">
>
> Right.
>
> > The test for following-sibling::item is applied on the source
> > document, *not*
> > the document after it has been sorted.  So the sorting will
> > not affect
> > anything.  Also, this is the same as:
> >
> > not(./following-sibling::item = .)
> >
> > which is always true, because a node is never a
> > following-sibling of itself.
> > Therefore, the next line (<item><xsl:value-of
> > select="."/></item>) will
> > always be executed.
>
> This is interesting because I run the script with
> MSXML3/MSXML4/XalanJ/Stylus and all of them print unique values
> If you run this stylesheet you can see yourself

You are absolutely right, I was wrong.  Sorry everyone.

Somehow I was thinking that "following-sibling::item = ." was using the 
nodes' identities, but in reality of course it compares their string() 
values.  So this does work.  Sorry Ivan.

>
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
>   <xsl:output method="xml" indent="yes"/>
>   <xsl:template match="/">
>     <list>
>       <xsl:for-each select="list/item">
>         <test><xsl:value-of select="."/>=<xsl:value-of
> select="following-sibling::item"/>=<xsl:value-of
> select="not(following-sibling::item = .)"/></test>
> 	  </xsl:for-each>
>     </list>
>   </xsl:template>
> </xsl:stylesheet>
>
> I also run your stylesheet (below) using MSXML3/MSXML4/XalanJ/Stylus the
> result is always 0

Funny, I get "1" as the result (with "Orange").  But you are right that I did 
make a typo: I forgot the [1] in:

<xsl:value-of select="count(list/item[count(key('item', string(.))[1] | .) = 
1])"/>
                                                                  ^^^

If I make that change, then it works.

Sorry for the confusion, maybe this is a bad night for my brain to be working 
:-)

>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
> <xsl:output method="text"/>
> <xsl:key name="item" match="item" use="string(.)"/>
> <xsl:template match="/">
>   <xsl:text>Unique items: </xsl:text>
>   <xsl:value-of select="count(list/item[count(key('item', string(.)) |
> .) = 1])"/>
> </xsl:template>
> </xsl:stylesheet>

-- 
Peter Davis
Cheer Up!  Things are getting worse at a slower rate.

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