Re: How do you flag a resource which is not available anymore?

This paper is generally relevant to the semantics, though it doesn't solve
the specific problem:

Representing and Querying Validity Time in RDF and OWL: A Logic-Based
Approach✩
Boris Motik, Oxford University Computing Laboratory, Oxford, UK

 http://www.cs.ox.ac.uk/boris.motik/pubs/m12validity-time.pdf

PROV-O can handle the use case, but has the downside of being PROV-O, and
requiring a few blank nodes (validity is a bit fuzzy).

http://www.w3.org/TR/2013/REC-prov-o-20130430/#invalidatedAtTime
http://www.w3.org/TR/2013/REC-prov-o-20130430/#Revision

Also, note that the ontology named by a version IRI is fixed;  if the IRI
becomes impossible to dereference, the cached content should always be
valid;  however, this may not be the case if the base IRI is used.  The
contents of the LOV-back-machine is as valid as it ever was.
 It is possible that an unversioned ontology  might have changed between
the last capture and the 404


On Fri, May 30, 2014 at 5:09 AM, Bernard Vatant <bernard.vatant@mondeca.com>
wrote:

> Hi vocabulers
>
> We have more and more records in LOV of which URIs are 404, unfortunately,
> with no replacing resource whatsoever.
> See e.g., http://lov.okfn.org/dataset/lov/details/vocabulary_dir.html etc
> We want to keep the record in LOV, along with backup versions, such as
> http://lov.okfn.org/dataset/lov/agg/archives/dir_dir/file_dir_2006-06-27.n3
>
> We want to flag the URI some way, such as some "offlineSince" or
> "validUntil" property, with value a xsd:date. This property would be added
> to the VOAF vocabulary, unless someone knows about an existing property to
> express that. There are various "valid" properties in DC terms and other
> vocabularies, but not sure they capture the expected semantics.
>
> Thanks for any suggestion.
>
> --
>
> *Bernard Vatant*
> Vocabularies & Data Engineering
> Tel :  + 33 (0)9 71 48 84 59
> Skype : bernard.vatant
> http://google.com/+BernardVatant
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