RE: FW: DN-FO-09: 15.1.11 fn:distinct-values

I have not seen many use cases that need the preservation of the input
order, especially on value sequences. Can you please provide a more
concrete use-case where preserving that order is important in the
context of dup-elimination?

Thanks
Michael

> -----Original Message-----
> From: public-qt-comments-request@w3.org [mailto:public-qt-comments-
> request@w3.org] On Behalf Of Ashok Malhotra
> Sent: Friday, July 25, 2003 2:45 PM
> To: Dimitre Novatchev; public-qt-comments@w3.org
> Cc: dnovatchev@europe.com
> Subject: RE: FW: DN-FO-09: 15.1.11 fn:distinct-values
> 
> 
> You are correct; document order is only defined for nodes.  My
mistake!
> I understand the semantic you desire but there is not a strong usecase
> for it.  For most purposes the order-by clause provides the required
> function.
> 
> All the best, Ashok
> 
> > -----Original Message-----
> > From: public-qt-comments-request@w3.org [mailto:public-qt-comments-
> > request@w3.org] On Behalf Of Dimitre Novatchev
> > Sent: Friday, July 25, 2003 2:34 PM
> > To: public-qt-comments@w3.org
> > Cc: dnovatchev@europe.com
> > Subject: Re: FW: DN-FO-09: 15.1.11 fn:distinct-values
> >
> >
> > > We have clarified the text to indicate that order of the output
> sequence
> > if
> > > implementation dependent.  We have also changed the wording of the
> > example
> > > as you suggested.
> >
> > Thank you.
> >
> > >
> > > If the user wants the output in a particular order, he can sort
the
> > values
> > > by document order by using $x/. or in any other order by using the
> > order-by
> > > clause.
> > >
> > > Please let us know if this is satisfactory.
> >
> > Document order is defined for nodes. We may want to preserve the
> *sequence
> > order*
> > between the distinct elements that would be returned.
> >
> > The example I gave before:
> >
> > I have the following sequence of random numbers:
> >
> > 3, 5, 2, 8, 6, 4, 9, 7, 1, 5, 2, 10, 9, 3
> >
> > I want to get only the (first occuring) distinct numbers with their
> > ordering
> > preserved:
> >
> > 3, 5, 2, 8, 6, 4, 9, 7, 1, 10
> >
> > This could be possible if the distinct-values() function was defined
> with
> > an
> > additional argument "preserve-order" (possibly with default value of
> > false).
> >
> >
> > fn:distinct-values($srcval as xs:anyAtomicType*,
> >                    $preserve-order as xs:boolean? ) as
> xs:anyAtomicType*
> >
> >
> > Cheers,
> > Dimitre Novatchev.
> >
> >
> >
> > __________________________________
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>

Received on Friday, 25 July 2003 17:59:22 UTC