- From: Oscar Corcho <ocorcho@fi.upm.es>
- Date: Fri, 04 Apr 2014 13:51:39 +0200
- To: Manfred Hauswirth <manfred.hauswirth@deri.org>, Abraham Bernstein <bernstein@ifi.uzh.ch>, "public-rsp@w3.org" <public-rsp@w3.org>
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/ >
Received on Friday, 4 April 2014 11:52:19 UTC