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

Lots of great points from Manfred. I just want to pick up and focus on one in this email.

On 22 Nov 2013, at 10:56, Manfred Hauswirth <manfred.hauswirth@deri.org<mailto:manfred.hauswirth@deri.org>> wrote:

*3. Streams and stream elements lacking reference to RDF*

Emanuele was commenting on this. I can, of course, do the following
replacements:

Streams => RDF Streams

(Live) Data Stream: An unbounded sequence of time-varying data elements.
=> (Live) RDF Data Stream: An unbounded sequence of time-varying data
elements encoded in RDF.

Recorded Data stream: A stream saved e.g. to a computer file.
=> Recorded RDF Data stream: An RDF stream saved e.g. to a computer file.

Elements in A Stream => Elements in An RDF Stream

...etc. etc. But is there something more substantial that we need to
say? Does it add value to insert RDF everywhere, or is it enough that
the group scope is RDF streams?

RDF is just a format IMHO that allows you to easily integrate the data and results with other data. Nothing more. All streams are the same in whatever notation they come.

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?

(Ducks ;) )

Alasdair

Alasdair J G Gray
Lecturer in Computer Science, Heriot-Watt University, UK.
Email: A.J.G.Gray@hw.ac.uk<mailto:A.J.G.Gray@hw.ac.uk>
Web: http://www.macs.hw.ac.uk/~ajg33
ORCID: http://orcid.org/0000-0002-5711-4872
Telephone: +44 131 451 3429
Twitter: @gray_alasdair
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