Hello!
I wonder if a way of recording changes in properties of resources can be
recommended. Many resources in real life have properties that have a
time range of being valid. In some datasets, only the current (or most
recent) state of a resource is stored, but in many cases it is important
to keep track of the history of development of a resource.
An example:
:john_smith
a foaf:person ;
foaf:name "John Smith" ;
Let's say that on 2013-09-27 John Smith marries Betty Jones. John Smith
is still the same person, so it makes sense to extend the same resource,
not create a new version:
:john_smith
a foaf:person ;
foaf:name "John Smith" ;
ex:marriedTo :betty_jones ;
How could I efficiently express the fact that the statement :john_smith
ex:marriedTo :betty_jones is valid from 2013-09-27? And if the couple
divorces, that the property has expired after a certain date? It would
be nice if the way of modelling makes it easy to request the most recent
state of a resource, any historical state, or a list of changes during a
time period.
A quick web scan on the subject revealed some interesting research
papers, but as far as I can tell all solutions need extensions of RDF
and/or SPARQL to work.
Perhaps this question is really about the ability to make statements
about a triple? Which is a problem for which no satisfactory solution
has been found yet?
Regards,
Frans
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Frans Knibbe
Geodan
President Kennedylaan 1
1079 MB Amsterdam (NL)
T +31 (0)20 - 5711 347
E frans.kni...@geodan.nl
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