Re: How to do an 'existence' test in XSL?

Here is a simple approach you can try..

<?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="/root">
  <root>
    <xsl:for-each select="gui">
      <xsl:if test="not(@type =
preceding-sibling::gui/@type)">
        <xsl:element name="{(_at_)type}" />
      </xsl:if>
    </xsl:for-each>
  </root>
</xsl:template>
  
</xsl:stylesheet>

When the above XSL is applied to XML -
<?xml version="1.0" encoding="UTF-8"?>
<root>
  <gui type="alertBox"></gui>
  <gui type="tooltip"></gui>
  <gui type="help"></gui>
  <gui type="tooltip"></gui>
  <gui type="alertBox"></gui>
  <gui type="tooltip"></gui>
  <gui type="help"></gui>
</root>  

The o/p recieved is -
<?xml version="1.0" encoding="UTF-8"?>
<root>
  <alertBox/>
  <tooltip/>
  <help/>
</root>

Regards,
Mukul

--- ben(_at_)autonomic(_dot_)net wrote:

> I'm having great difficulty understanding how/if XSL
> provides the tool to satisfy the following simple
> requirement. 
>
> Lets say I have some simple xml like :
>
> <gui type="alertBox">...</gui>
> <gui type="tooltip">...</gui>
> <gui type="help">...</gui>
> <gui type="tooltip">...</gui>
> <gui type="alertBox">...</gui>
> <gui type="tooltip">...</gui>
> <gui type="help">...</gui>
>
> To simplify things... imagine transforming this
> document in such a way that we have something like :
>
> <alertBox/>
> <tooltip/>
> <help/>
>
> i.e. I would like the XSL to result in one output
> per gui type.
>
> So there is the problem... how on earth do I process
> the xml such that it results in an output per +type+
> rather than for each instance (is that explained
> well enough?)... i.e. it's easy to match on the
> attributes but each match produces output so I would
> get :
>
> <alertBox/><alertBox/>
> <tooltip/><tooltip/><tooltip/>
> <help/><help/>
>
> Can anyone offer advice on the way in which I ought
> to approach this problem?
>
> Kindest regards,
>
> Ben
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