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Re: [xsl] XSLT 2 and XSLT 3: Best Way To Get Set of Unique Docs for A Set of Elements

2019-03-05 14:04:34
To find the different document nodes just use:

$links/root(.)

Remember that in a node-set all nodes have different identity (this is
exactly what "set" means)


Cheers,
Dimitre

On Tue, Mar 5, 2019 at 11:08 AM Eliot Kimber ekimber(_at_)contrext(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Given the variable $links that is a sequence of element()s where the elements 
could be from different documents, what is the best way to get the set of 
unique documents?

I need an XSLT 2 answer but an XSLT 3 answer would also be useful.

I feel like there's an obvious solution I'm overlooking but the only thing I 
can think of is to compare the document-uri() values of all the elements:

    <xsl:variable name="topicURIs" as="xs:string*"
      select="distinct-values(for $e in $links return document-uri(root($e)))"
    />
    <xsl:variable name="topics" as="document-node()*"
        select="
        for $uri in $topicURIs
        return root(($links[document-uri(root(.)) eq $uri])[1])
        "
    /> 

This works but seems unnecessarily complicated.

Thanks,

Eliot
--
Eliot Kimber
http://contrext.com





-- 
Cheers,
Dimitre Novatchev
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