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"?
That's because http://en.wikipedia.org/wiki/Southern_Ocean doesn't have an Infobox, just a set of coordinates. You could try looking for all resources with rdf:type http://www.opengis.net/gml/_Feature (the type that DBpedia sets when a resource has coordinates). On the other hand, there will probably be some places that don't have coordinates and thus don't have this type, so maybe you should look for resources that have type dbpedia-owl:Place OR gml:_Feature . JC > 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? >> >> >> ------------------------------------------------------------------------------ >> Everyone hates slow websites. So do we. >> Make your web apps faster with AppDynamics >> Download AppDynamics Lite for free today: >> http://p.sf.net/sfu/appdyn_d2d_feb >> _______________________________________________ >> Dbpedia-discussion mailing list >> Dbpedia-discussion@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion >> > > > > ------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_feb > _______________________________________________ > Dbpedia-discussion mailing list > Dbpedia-discussion@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
