RE: RSP Query Semantics - RDF Stream Processing Community Group

Indeed. 

We already agreed on intervals. And in using graphs.
As Oscar points out, there is still a lot of cleanup (tidying) and refinement to do in the Wiki.
In fact, I think in the following months we can shape a more robust document with all our modelling efforts.
So we're on the same track I think.

Jean-Paul 


> Date: Fri, 4 Apr 2014 13:51:39 +0200
> From: ocorcho@fi.upm.es
> To: manfred.hauswirth@deri.org; bernstein@ifi.uzh.ch; public-rsp@w3.org
> Subject: Re: RSP Query Semantics - RDF Stream Processing Community Group
> 
> Hi all,
> 
> Don’t panic!! ;-) Sure, I think that we all had a common agreement, and it
> is more about not having had enough time slots / workforce to edit it ;-)
> 
> As you can see from the history of the page, intervals were already
> considered in the wiki page edition of the 6th of March
> (https://www.w3.org/community/rsp/wiki/index.php?title=RSP_Query_Semantics&

> oldid=209), where we were focusing on defining the semantics of windows
> and were talking about the two possibilities (in fact, intervals are
> considered in that section of the wiki page).
> 
> Then we started adding what we understand by the model, and it is true
> that intervals are missing from there. The discussion moved as well into
> which other representations could be valid.
> 
> So, happy to have somebody editing it.
> 
> Oscar
> 
> -- 
> 
> Oscar Corcho
> Ontology Engineering Group (OEG)
> Departamento de Inteligencia Artificial
> Facultad de Informática
> Campus de Montegancedo s/n
> Boadilla del Monte-28660 Madrid, España
> Tel. (+34) 91 336 66 05
> Fax  (+34) 91 352 48 19
> 
> 
> 
> 
> 
> 
> El 04/04/14 13:36, "Manfred Hauswirth" <manfred.hauswirth@deri.org>
> escribió:
> 
> >Dear all,
> >
> >Avi is right IMHO! We discussed this a number of times and I thought we
> >had agreed that intervals are essential (also from our practical
> >experience in a lot of projects).
> >
> >So, I fully support Avi's proposal.
> >
> >Cheers,
> >
> >Manfred
> >
> >On 04/04/14 09:30, Abraham Bernstein wrote:
> >> Dear all
> >>
> >> I just to the Query semantics page
> >> (http://www.w3.org/community/rsp/wiki/RSP_Query_Semantics ). Reading the
> >> text I saw that the page says:
> >>
> >> G = {( subj, pred, obj)}
> >>
> >> and
> >>
> >> A stream is a sequence (G, τ ) where τ ∈ T the set of all timestamps.
> >>
> >> This worries me!
> >>
> >> As we discussed a number of time (I believe I raised the issue back last
> >> September
> >> http://lists.w3.org/Archives/Public/public-rsp/2013Sep/0027.html and it
> >> seemed to me that we got agreement on the issue
> >> http://lists.w3.org/Archives/Public/public-rsp/2013Dec/0010.html)
> >> */intervals are elemental/*. Many things do not happen in one moment of
> >> time but are really things that are happening over time. Hence, I would
> >> prefer a formulation like the following:
> >>
> >> A stream is a sequence (G, τ ) where τ ∈ T the set of all *intervals*.
> >>
> >> τ = [t_s, t_e], where t_s denotes the start time and t_e denotes the end
> >> time.
> >>
> >> As a short hand notation we could say that when t_s = t_e then one can
> >> only write one of them.
> >>
> >> What do you guys think?
> >>
> >> Avi
> >>
> >>
> >> -----------------------------------------------------------------
> >> |  Professor Abraham Bernstein, PhD
> >> |  University of Zürich, Department of Informatics
> >> |  web: http://www.ifi.uzh.ch/ddis/bernstein.html

> >>
> >
> >-- 
> >Prof. Manfred Hauswirth
> >INSIGHT Centre for Data Analytics
> >Digital Enterprise Research Institute (DERI)
> >National University of Ireland, Galway
> >http://www.manfredhauswirth.org/
> >
> 
> 
>