On 10/15/14 8:36 AM, Frans Knibbe | Geodan wrote:
On 2014-10-13 14:14, John Walker wrote:Hi Frans, See this example: http://patterns.dataincubator.org/book/qualified-relation.htmlThank you John! Strangely enough, I had not come across the Linked Data Patterns book before. But I can see it is a valuable resource with solutions for many common problems. And it looks pretty too! I am sure it will come in handy for problems that I haven't stumbled upon yet.A nice thing about this solution is that it doesn't need any extensions of core technologies. I do see some downsides, though:Let's assume I want to publish data about people, as in the examples. A person can have common properties defined by the FOAF vocabulary, like foaf:age or foaf:based_near. Properties like these are likely to change. If I want to record the time in which a statement is valid I would have to create a class for that relationship and add properties to that class that will allow me to associate a start time and an end time with the class. But by doing that I would not only be forced to create my own vocabulary, I would also replace common web wide semantics with my own semantics. Or would it still be possible to relate the original property with the custom class somehow?In the cases known to me that require the recording of history of resources, /all/ resource properties (except for the identifier) are things that can change in time. If this pattern would be applied, it would have to be applied to all properties, leading to vocabularies exploding and becoming unwieldy, as described in the Discussion paragraph.I think that the desire to annotate statements with things like valid time is very common. Wouldn't it be funny if the best solution to a such a common and relatively straightforward requirement is to create large custom vocabularies?Regards, Frans
Frans, How about reified RDF statements?I think discounting RDF reification vocabulary is yet another act of premature optimization, in regards to the Semantic Web meme :)
Some examples:[1] http://bit.ly/utterances-since-sept-11-2014 -- List of statements made from a point in time.
[2] http://linkeddata.uriburner.com/c/8EPG33 -- About Connotation -- Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog 1: http://kidehen.blogspot.com Personal Weblog 2: http://www.openlinksw.com/blog/~kidehen Twitter Profile: https://twitter.com/kidehen Google+ Profile: https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile: http://www.linkedin.com/in/kidehen Personal WebID: http://kingsley.idehen.net/dataspace/person/kidehen#this
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