- From: Abraham Bernstein <bernstein@ifi.uzh.ch>
- Date: Fri, 22 Nov 2013 17:53:05 +0100
- To: Axel Polleres <axel@polleres.net>
- Cc: "Gray, Alasdair J G" <A.J.G.Gray@hw.ac.uk>, "public-rsp@w3.org" <public-rsp@w3.org>
Hi all My apologies for not being able to participate on the call… On 22 Nov 2013, at 12:55, Axel Polleres <axel@polleres.net> wrote: > FWIW, > > On Nov 22, 2013, at 12:34 PM, "Gray, Alasdair J G" <A.J.G.Gray@hw.ac.uk> wrote: > >> I completely agree with this. Indeed we should see if we can just repurpose the existing stream definitions for use in the group. >> >>> What RDF gives you is a general framework and a nice general data model, e.g., a graph which changes its shape and constituting data over time and RDF as a nice formalism to capture this. >> >> This is a really interesting point. In the relational model, a tuple carries a certain amount of information which is more than can be captured in a single triple. My question is, should a timestamp be applied at a triple level – with several triples purporting to the same event being given different timestamps – or to a graph – where all triples about an event are captured together? > > I agree that this is a crucial point: In the context of RDF and it's inherent idea to be able to model incomplete data, it is not entirely clear as in relational data when a complete object or tuple has arrived over a stream (which may be viewed as an event per se). I guess this is what makes it difficult to make assumptions about (or even define) things like window sizes, etc. in streamed RDF. We had a brief discussion earlier that one could consider not to time/interval-stamp the triples but graphs (in the named graph sense). The advantage would be that we would have data chunks - i.e., graphs - that can be transmitted together whilst being able to model incomplete data. My 2 cents Cheers Avi > > best, > Axel > > > > -- > Prof. Dr. Axel Polleres > Institute for Information Business, WU Vienna > url: http://www.polleres.net/ twitter: @AxelPolleres > > ----------------------------------------------------------------- | Professor Abraham Bernstein, PhD | University of Zürich, Department of Informatics | web: http://www.ifi.uzh.ch/ddis/bernstein.html
Received on Saturday, 23 November 2013 10:31:13 UTC