Duck and cover! I sense a deep discussion about to start on whether an
ocean is a place, a body of water, both of those things or neither of those
things. :)
What about avoiding the ontological discussion and just searching for
things that have geolocation?
Cheers
Pablo
On Fri, Mar 1, 2013 at 9:53 AM, Amir Hossein Jadidinejad <
amir.jad...@yahoo.com> wrote:
> It's great. But I have a problem.
> Some instances such as: "http://dbpedia.org/page/Southern_Ocean"; is not
> recognized as "Place"?
> Is it posiible to change the following query to manage all locations?
>
> ASK {
> {
> ?thing a ?p .
> ?p rdfs:subClassOf dbpedia-owl:Place OPTION (transitive).
> }
> UNION
> {
> ?thing a dbpedia-owl:Place .
> }
> }
>
> ------------------------------
> *From:* Ben Companjen <bencompan...@gmail.com>
> *To:* Amir Hossein Jadidinejad <amir.jad...@yahoo.com>
> *Cc:* DBpedia <dbpedia-discussion@lists.sourceforge.net>
> *Sent:* Thursday, February 28, 2013 1:58 AM
> *Subject:* Re: [Dbpedia-discussion] Information Extraction using DBpedia
>
> Hi Amir,
>
> The reasoning you want is the classic deductive reasoning using
> classes and subclasses.
> Settlement is defined as a subclass of Place (although maybe not
> directly). That means that all Things that are Settlements are also
> Places. Tehran is a Settlement, so it is also a Place.
>
> If you want to see whether some Thing is a Place, you should look at
> the rdf:type and reason your way up via rdfs:subClassOf and see if you
> end up at Place.
> The class Place in DBpedia has URI
> <http://dbpedia.org/ontology/Place>. DBpedia has an option
> "transitive", that can be used to make subclasses of subclasses match
> as well. I'm not sure that that option is part of SPARQL, so this
> option may not work everywhere.
>
> To select 100 items that are in a subclass of Place:
>
> select distinct ?Concept
> where {?Concept a ?p .
> ?p rdfs:subClassOf dbpedia-owl:Place OPTION (transitive).} LIMIT 100
>
> With SPARQL ASK you can ask whether there is a match. Is
> dbpedia:Tehran in a subclass of Place? (DBpedia says "true")
>
> ASK
> {dbpedia:Tehran a ?p .
> ?p rdfs:subClassOf dbpedia-owl:Place OPTION (transitive).
> }
>
> But in case you're looking for something that is only defined as a
> Place and not as a subclass of Place, you need to know whether Place
> is a subclass of Place.
>
> ASK
> {
> dbpedia-owl:Place rdfs:subClassOf dbpedia-owl:Place OPTION (transitive).
> }
>
> ... says "false".
>
> So you want to ASK if some Thing is a Place or a subclass of a Place.
>
> ASK {
> {
> ?thing a ?p .
> ?p rdfs:subClassOf dbpedia-owl:Place OPTION (transitive).
> }
> UNION
> {
> ?thing a dbpedia-owl:Place .
> }
> }
>
> Replace ?thing by the URI of the Thing you want to check.
> I think you can construct the queries for Person and Organisation yourself
> :)
>
> Good luck!
>
> Ben
>
> On 27 February 2013 17:56, Amir Hossein Jadidinejad
> <amir.jad...@yahoo.com> wrote:
> > Hi,
> > I have a simple IE task. Simply want to distinguish between "PERSON",
> > "LOCATION" and "ORGANIZATION" concepts. It means that I have a DBpedia's
> > URI, what is the type ("PER", "LOC" and "ORG") of this resource?
> > Using the following query I can get resource's type:
> >
> > SELECT * WHERE { <http://dbpedia.org/resource/Tehran> a ?o }
> >
> > but the output contains different labels (such as "Settlement",
> > "IranianProvincialCapitals" and etc.). I don't know how to reason from
> this
> > output?
> > Currently, I have a lot of "if...then" conditions which test if the
> output
> > contains "place" (for example) or not:
> >
> > if (tobject.contains("place") || tobject.contains("locations")
> >
> > || tobject.contains("ProtectedArea")
> > || tobject.contains("SkiArea")
> > || tobject.contains("WineRegion")
> > || tobject.contains("WorldHeritageSite")
> > || ....)
> >
> > It's really not a good way. These classes are structured in an
> ontological
> > manner. Would you please help me to construct a query to "reason" the
> type
> > of each resource ("PER", "LOC" and "ORG") in DBpedia?
> >
> >
> ------------------------------------------------------------------------------
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> >
>
>
>
>
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>
--
Pablo N. Mendes
http://pablomendes.com
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