Re: [xsl] XQuery/XPath 3.1: Node List to Node Set ("distinct nodes")

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On Wed, Dec 29, 2021 at 12:21 AM Martin Honnen martin.honnen@xxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

>
> Am 29.12.2021 um 00:32 schrieb Dimitre Novatchev dnovatchev@xxxxxxxxx:
>
>
>
>
>
> Hit Send too early:
>
> Do notice: this seems the only solution of all presented so far, that
> preserves the original sequence order (not document order) of the nodes.
>
> Why is the original sequence order preserved?
> https://www.w3.org/TR/xpath-functions/#func-distinct-values clearly says
>
> "The function returns the sequence that results from removing from $arg all
> but one of a set of values that are considered equal to one another. [...]
>
> The order in which the sequence of values is returned is B7
> implementation-dependentB7
> <https://www.w3.org/TR/xpath-functions/#implementation-dependent>.
>
> Which value of a set of values that compare equal is returned is B7
> implementation-dependentB7
> <https://www.w3.org/TR/xpath-functions/#implementation-dependent>."
>
>
> So while
>
>    $nodes ! generate-id(.)
>
> gives you the generated ids in the order of the nodes in $nodes after the
> call to distinct-values there is no order defined, it is implementation
> dependent.
>

@Martin Honnen <Martin.Honnen@xxxxxx> Could you, please, give us an example
of an existing XPath engine whose implementation of `distinct-values()`
produces its results in any other order than their original order in the
input sequence?

Cheers,
Dimitre


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--
Cheers,
Dimitre Novatchev
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