representing time in RDF

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Valentijn van Dijk

Apr 22, 2021, 12:58:37 PM4/22/21
to Nanopublications
Hello Nanofriends, 

Concerning my question in this month's meeting on representing time, here is an article on the topic, if anyone is interested:

Gutierrez et al, 2007, Introducing time into RDF  

As Tobias rightly remarked, my question was really about RDF, not nanopub's specifically. 

Best regards, 


Tobias Kuhn

Apr 23, 2021, 3:15:37 AM4/23/21
to Valentijn van Dijk, Nanopublications
Hi Valentijn and all,

Interesting topic.

RDF by itself is agnostic about time. In the work you point to, they
seem to define an extension of RDF where time semantics is deeply
embedded. This is interesting, but I am not sure about how much uptake
this has had in the meantime (I am not aware of any, but the paper seems
to have been well cited).

Nanopublications, in the way I have used them so far, also share the
time agnostic nature of RDF, except for the fact that they are immutable
and thereby created at a certain given timepoint (and this is typically
recorded in the pubinfo graph).

This doesn't mean that you cannot express time, it just means that the
form and meaning are delegated to the used ontologies. It would be
interesting to explore the consequences of this, and think about whether
a more uniform handling of time would be beneficial.

Just my 2 cents.

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Gianmaria Silvello

Apr 23, 2021, 3:30:04 AM4/23/21
to Valentijn van Dijk, Nanopublications, Tobias Kuhn
Hi All, 

My two cents on time. 

The mentioned paper is impactful because it is the first complete treatment of time in RDF. On the practical side, it has been surpassed by other proposals like RDF*, which in turn is still an academic effort and not really usable; at least, for now. 
I guess that Gutierrez et al. published the work before named graphs were a real thing. 

Time is a beast, especially in an open and almost unconstrained domain. 
Very interesting (and useful), though.


P.S. Apologies for skipping so many meetings. There is always something popping up last minute.

Gianmaria  Silvello, PhD
Associate Professor

Intelligent Interactive Information Access (IIIA) Hub
Department of Information Engineering
University of Padua
Via Gradenigo 6/a,  35131 Padua, Italy
Tel: +39 049 827 7932

Skype: gianmaria.silvello
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Valentijn van Dijk

Apr 23, 2021, 8:06:59 AM4/23/21
to Nanopublications
Hello All,
Thanks for your clarifications and insights, Tobias and Gianmaria.  Here is a recent overview of this complex topic: 

Zhang et al, 2021, RDF for temporal data management - a survey.

It may be relevant to Jorrit's issue too.



Op vrijdag 23 april 2021 om 09:30:04 UTC+2 schreef Gianmaria Silvello:
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