+100!
Separation of T-Box and A-Box descriptions seems quite a reasonable
requirement, in particular when there are so many instances!
Or does it mean that the only way to describe the class "Person" is in
extension : nobody can provide a definition of what a Person is, but
everybody knows when she meets one :)
Bernard
2012/5/30 Adrian Gschwend <[email protected]>
> Hi group,
>
> We work on some software which heavily relies on the ontologies used by
> the data. This means we dereference the ontologies used on data sets and
> do some inference to figure out additional stuff about the data. For
> most ontologies this works pretty well.
>
> Last week we were test driving our software against some data at
> DBPedia, namely the page of Tim Berners-Lee at
> http://dbpedia.org/resource/Tim_Berners-Lee
>
> So far so good, in there we have several rdf:type definitions, including
> dbpedia-owl:Person, which points to http://dbpedia.org/ontology/Person
>
> On that point we noticed that it took way too long to get the page,
> cache it and do some stuff on it. So we started analyzing it and did it
> by hand:
>
> % curl -I -H "Accept: application/rdf+xml"
> http://dbpedia.org/ontology/Person
>
> HTTP/1.1 303 See Other
> Date: Mon, 21 May 2012 19:00:08 GMT
> Content-Type: application/rdf+xml
> Connection: keep-alive
> Server: Virtuoso/06.04.3132 (Linux) x86_64-generic-linux-glibc25-64 VDB
> Accept-Ranges: bytes
> Location: http://dbpedia.org/data3/Person.rdf
> Content-Length: 0
>
> Not a problem, the system can handle redirects. So we get the other file
> instead. And boy were we confused: It returns an 8MB file for the
> request (which took quite some time to get btw) After analyzing it in
> rapper I figured out that we got about 50'000 triples, probably less
> than 20 are really related to the ontology and the rest is stuff like:
>
> <http://dbpedia.org/resource/Zygmunt_Balicki>
> a <http://dbpedia.org/ontology/Person> .
>
> While I do see that this "reverse property" or however it is called
> might be interesting when I browse the data set in my web browser it is
> in my opinion plain wrong to return it on the URI which dereferences the
> ontology.
>
> Our software is also targeted at smart phones, you can imagine that it
> is not really fun to get 50'000 triples back on a crappy 3G link with
> volume limits and then parse and cache them on a device which is running
> on battery power. If I do that on several dbpedia data sets I'm probably
> out of power very soon and didn't even get half of the ontologies used
> in the data.
>
> What is your opinion on that? Is there a good reason for this or did you
> just think it might be useful? As you can see this pretty much kills the
> way we use ontologies and I think the "classical" way to dereference
> ontologies makes way more sense, so I would vote to change this behavior
> on dbpedia and return uniquely the definition itself.
>
>
> thanks
>
> cu
>
> Adrian
>
>
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*Bernard Vatant
*
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