Hi Frans, See this example: http://patterns.dataincubator.org/book/qualified-relation.html
Regards, John Walker Principal Consultant & co-founder Semaku B.V. SFJ 4.009, Torenallee 20, 5617 BC Eindhoven Mobile: +31 6 475 22030 Email: [email protected] Skype: jaw111 KvK: 58031405 BTW: NL852842156B01 IBAN: NL94 INGB 0008 3219 95 > On October 13, 2014 at 1:54 PM Frans Knibbe | Geodan <[email protected]> > 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 > E [email protected] <mailto:[email protected]> > <http://www.geodan.nl> > | disclaimer <http://www.geodan.nl/disclaimer> > > --------------------------------------------- >
