RSP Query Semantics - RDF Stream Processing Community Group

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
 

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|  Professor Abraham Bernstein, PhD
|  University of Zürich, Department of Informatics
|  web: http://www.ifi.uzh.ch/ddis/bernstein.html