Hi Valentijn and all,
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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