Re: What is a stream element? (was RSP next calls)

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