Re: [xsl] distinct values by xslt

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

JS,

On 5/19/2011 3:05 AM, JS Rawat wrote:
> Hi Wendell,
> I am using XSLT 2.0. will you please integrate it into below xslt!!!

I'm afraid I can't do that pro bono, at least not today.

Maybe someone else will pick it up. Even better, I am sure the effort 
required to learn how to apply the method yourself will be a very good 
investment.

Regards,
Wendell

> As I understand it, this isn't really a "distinct values" problem, but
> rather a problem of discriminating between nodes within sets of nodes, all
> of which have the same values associated with them. The first question here
> is whether this must be XSLT 1.0, or whether XSLT 2.0 can be used.
>
> If you want to determine whether a node is the first node in the document
> with a specific value associated with it (such as the first 'link' element
> with a given @rid value), a good solution can be to use a
> key:
>
> <xsl:key name="link-by-rid" match="link" use="@rid"/>
>
> Once this key is set up, you can examine any $link (where $link is a single
> 'link' element):
>
> XSLT 1.0:
>
>    generate-id($link) = generate-id(key('link-by-rid',$link/@rid)[1])
>
> XSLT 2.0:
>
>    $link is key('link-by-rid',$link/@rid)[1]
>
> This method will also be faster, typically, than using the preceding:: axis.
>
> You can do the same thing without a key, but that will often be slower too
> (it depends on the processor):
>
> XSLT 1.0:
>
>    generate-id($link) = generate-id((//link[@rid=$link/@rid])[1])
>
> XSLT 2.0:
>
>    $link is (//link[@rid=$link/@rid])[1]
>
> The extra parentheses are necessary here, unless you opt to use the
> descendant:: axis instead of //.
>
> Cheers,
> Wendell

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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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