Re: RSP Query Semantics - RDF Stream Processing Community Group

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