Re: How to model valid time of resource properties?

Hi Frans,

See this example:
http://patterns.dataincubator.org/book/qualified-relation.html

Regards,

John Walker
Principal Consultant & co-founder
Semaku B.V.
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> On October 13, 2014 at 1:54 PM Frans Knibbe | Geodan <frans.knibbe@geodan.nl>
> wrote:
> 
>  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
> 
> 
>  ---------------------------------------------
>  Frans Knibbe
>  Geodan
>  President Kennedylaan 1
>  1079 MB Amsterdam (NL)
> 
>  T +31 (0)20 - 5711 347
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