Re: How to model valid time of resource properties?

> If I may try to summarize, it is saying that neither reification

Not exactly, please note the difference between RDF reification and 
conceptual reification. IMHO, the last mentioned is the way to go.

Best,
Krzysztof


On 10/16/2014 08:15 AM, Frans Knibbe | Geodan wrote:
> On 2014-10-14 19:24, Carsten Keßler wrote:
>> Dear all,
>>
>> here’s another paper that discusses different approaches: 
>> http://carsten.io/trame-kessler-kuhn-cosit2013.pdf
>
> Thank you! Yes, that paper is also a good read. Now my head is 
> spinning even more :-)
>
> If I may try to summarize, it is saying that neither reification nor 
> named graphs are satisfactory solutions, but turning/events/ into 
> first class citizens and making them explicit /is/.
>
> Do you think this approach in recommendable in all cases where 
> resources have properties that can undergo change? Wouldn't it 
> obfuscate direct relationships between things in much the same way as 
> turning a property into a class would?
>
> Regards,
> Frans
>
>
>>
>> Best,
>> Carsten
>>
>> ---
>> Carsten Kessler – http://carsten.io
>> Center for Advanced Research of Spatial Information
>> Department of Geography
>> Hunter College – CUNY
>> 695 Park Avenue
>> New York, NY-10065
>>
>> On Monday, October 13, 2014 at 8:32, Anisa Rula wrote:
>>
>>> Hi,
>>>
>>> our paper [1] surveys all the possible approaches for representing 
>>> temporal information in the context of Linked Data. You may find it 
>>> useful for your work.
>>>
>>> Best regards,
>>> Anisa
>>>
>>> 1. http://iswc2012.semanticweb.org/sites/default/files/76490481.pdf
>>>
>>>
>>> On 13 Oct 2014, at 14:16, Sarven Capadisli <info@csarven.ca 
>>> <mailto:info@csarven.ca>> wrote:
>>>
>>>> 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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> Frans Knibbe
> Geodan
> President Kennedylaan 1
> 1079 MB Amsterdam (NL)
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-- 
Krzysztof Janowicz

Geography Department, University of California, Santa Barbara
4830 Ellison Hall, Santa Barbara, CA 93106-4060

Email: jano@geog.ucsb.edu
Webpage: http://geog.ucsb.edu/~jano/
Semantic Web Journal: http://www.semantic-web-journal.net