- From: Manfred Hauswirth <manfred.hauswirth@deri.org>
- Date: Fri, 04 Apr 2014 12:36:24 +0100
- To: Abraham Bernstein <bernstein@ifi.uzh.ch>, "public-rsp@w3.org" <public-rsp@w3.org>
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 11:36:52 UTC