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

[Dimtre Novatchev <dnovatchev@xxxxxxxxx>]

In case you know all possible types in advance, a simple (but not
too-efficient) way of picking up all "existing" gui types is the
following:

<xsl:stylesheet version="2.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
 xmlns:xs="http://www.w3.org/2001/XMLSchema";
 >
 
 <xsl:output method="text"/>

 <xsl:param name="pAllStyles" as="xs:string+" 
 select="'alertBox', 'combo', 'help', 'tooltip'"/>
  
 <xsl:variable name="vDoc" select="/"/>

  <xsl:template match="/">
    <xsl:value-of separator="&#xA;" select=
    "$pAllStyles[. = $vDoc/styles/gui/@type ]" />
  </xsl:template>
</xsl:stylesheet>

When this transformation is applied on your source xml (provided with
a single element parent):

<styles>
  <gui type="alertBox"/>
  <gui type="tooltip"/>
  <gui type="help"/>
  <gui type="tooltip"/>
  <gui type="alertBox"/>
  <gui type="tooltip"/>
  <gui type="help"/>
</styles>

the wanted result is produced:

alertBox
help
tooltip


Cheers,
Dimitre.



On Wed, 22 Dec 2004 14:33:06 +0000, ben@xxxxxxxxxxxxx <ben@xxxxxxxxxxxxx> 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