Re: Proposal of definition for timestamped graph

Hi Tara,

Thanks for taking the time to write this up. I think it captures what we were discussing. You state two limitations of the model

  *   does not cover the case when the timestamp is an interval.
  *   does not allow the default graph of a timestamped graph to have more than triple.

The first I think is more that we do not support intervals in the object of a triple. However by supplying more than one triple with the graph name as the subject you can model an interval.

I do not understand what you are trying to state with the second limitation. Can you explain a bit further?

thanks

Alasdair

On 26 June 2015 at 17:46:50, Tara Athan (taraathan@gmail.com<mailto:taraathan@gmail.com>) wrote:

I have created a pull request for the proposal for a revised definition,
and included some examples. The previous definition is still visible from:

https://github.com/streamreasoning/RSP-QL/blob/master/Semantics.md


while the new definition, plus some possible serializations, can be seen
in my fork

https://github.com/greenTara/RSP-QL/blob/master/Semantics.md


There is a slight merge conflict, but I think it is not too bad.
Apparently I did not pull the latest commit from Alasdair. But I am
requesting that the pull NOT be merged yet so we can easily compare the
previous definition to the new proposal.

I still have some concerns about the case where the named graph is not
included in the timestamped graph, i.e. only the IRI that is its name is
transmitted. Unless the timestamped graph is interpreted in some
"context" where there is some set of known named graphs, this
formulation seems to leave the semantics of a timestamped graph at the
mercy of the state of the internet (for dereferencing the named graph).

Tara

--
Alasdair J G Gray
Lecturer, Heriot-Watt University
Web: http://www.alasdairjggray.co.uk

ORCID: http://orcid.org/0000-0002-5711-4872

Twitter: @gray_alasdair
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