On 2014-10-13 13:54, Frans Knibbe | Geodan 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
Hi Frans,This is not a comprehensive answer on this topic, but you might want to take a look at PROV-O [1] (which can address validity and history of entities) and maybe even employ OA [2].
Capturing temporal dimension of linked data by Jindřich Mynarz is an excellent read [3].
[1] http://www.w3.org/TR/prov-o/ [2] http://www.openannotation.org/spec/core/[3] http://blog.mynarz.net/2013/07/capturing-temporal-dimension-of-linked.html
-Sarven http://csarven.ca/#i
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