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 <[email protected]>
>To: Amir Hossein Jadidinejad <[email protected]>
>Cc: DBpedia <[email protected]>
>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
><[email protected]> 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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