Hi Bastian, generally, if an infobox property is mapped to an ontology object property, the DBpedia framework "searches" for Wikilinks in the infobox property value. For instance a fictitious property: | country = World cup 2010 in [[South Africa]]. If this property is mapped to an ontology object property, the DBpedia framework would extract a triple with an object: <http://dbpedia.org/resource/South_Africa>. If the infobox property is mapped to an ontology datatype property with xsd:string as range, the framework would extract a triple with an literal as object: "World cup 2010 in South Africa"@en . In a case where an infobox value doesn't contain a link, but is mapped to an ontology object property, normally nothing would be extracted. But the framework do some simple entity recognition. In your example: "|Lage=Südafrika" a Wikipedia article exists that has exactly the name of the property value: http://de.wikipedia.org/wiki/S%C3%BCdafrika. Therefore the framework is able to extract the correct resource.
regards, Paul -------- Original-Nachricht -------- > Datum: Mon, 4 Apr 2011 09:52:46 +0200 > Von: Bastian Gorholt <[email protected]> > An: Paul Kreis <[email protected]> > CC: [email protected] > Betreff: Re: [Dbpedia-discussion] Missing properties after mapping extraction > Hi Paul, > > I don't know if I got you right. > > > With a look at the infobox of Ushuaia you can see that the property > values don't contain wikilinks. "Provinz" is mapped to the > OntologyProperty:County, "Bürgermeister" is mapped to > OntologyProperty:LeaderName and URL is > mapped to OntologyProperty:WikiPageExternalLink (personally, I would prefer > foaf:homepage btw). All of these three ontology properties are object > properties, therefore they expect a wikilink. > > Do you mean that merely such properties can be extracted: [[some > value]]? If that is true I wonder why also simple values (without the > brackets) are extracted in other cases. For instance in > http://de.wikipedia.org/wiki/Addo-Elefanten-Nationalpark the property > |Lage=Südafrika is evaluated and the information does not vanish > during the extraction process. Just test the mapping at > http://mappings.dbpedia.org/index.php/Mapping_de:Infobox_Schutzgebiet. > > Cheers, > Bastian > > > > > -------- Original-Nachricht -------- > >> Datum: Fri, 1 Apr 2011 12:55:58 +0200 > >> Von: Bastian Gorholt <[email protected]> > >> An: [email protected] > >> Betreff: [Dbpedia-discussion] Missing properties after mapping > extraction > > > >> Hi everybody, > >> > >> I encountered another problem after defining new mappings for dbpedia. > >> I created a German mapping "Ort in Argentinien": > >> > http://mappings.dbpedia.org/index.php/Mapping_de:Infobox_Ort_in_Argentinien > >> > >> As you can see it includes mappings for the properties "Provinz" and > >> "URL". Unfortunately when I test the mapping the mapped properties > >> province and wikiPageExternalLink are not within the results, at all. > >> Furthermore if you have a look at the results of Ushaia and compare > >> them with the source text of the corresponding article > >> http://de.wikipedia.org/wiki/Ushuaia you will recognize additional > >> missing properties: department (Departamento) and leaderName > >> (Bürgermeister). > >> > >> Does anybody spot the root of all evil in this example? > >> > >> Cheers, > >> Bastian > >> > >> > ------------------------------------------------------------------------------ > >> Create and publish websites with WebMatrix > >> Use the most popular FREE web apps or write code yourself; > >> WebMatrix provides all the features you need to develop and > >> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf > >> _______________________________________________ > >> Dbpedia-discussion mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion > > > > > ------------------------------------------------------------------------------ > > Create and publish websites with WebMatrix > > Use the most popular FREE web apps or write code yourself; > > WebMatrix provides all the features you need to develop and > > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf > > _______________________________________________ > > Dbpedia-discussion mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion > > ------------------------------------------------------------------------------ Create and publish websites with WebMatrix Use the most popular FREE web apps or write code yourself; WebMatrix provides all the features you need to develop and publish your website. http://p.sf.net/sfu/ms-webmatrix-sf _______________________________________________ Dbpedia-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
