Hi Bastian,
yes, you hit on a weakness of the current mapping language. Right now, a mapper
could do nothing. The mapping language doesn't provide a sufficient solution
for this problem. We have this issue on our to-do list. A possibility could be
to transfer the "{{#switch: {{{Provinz|}}}"-template with its abbreviations to
a conditional mapping that defines constant values to ontology properties.
regards,
paul
-------- Original-Nachricht --------
> Datum: Wed, 6 Apr 2011 09:32:26 +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,
>
> ok now I get it. With your explanation in mind I'm just wondering how
> to circumvent the obstacles set by articles that use infoboxes like
> "Ort_in_Argentinien". The problem is that when using the template one
> has to select a specific province which is defined in a list of
> provinces:
>
> | [[Liste der Provinzen Argentiniens|Provinz]]:
> | {{#switch: {{{Provinz|}}}
> |Salta = [[Salta (Provinz)|Salta]]
> |Buenos Aires (Provinz) = [[Buenos Aires (Provinz)|Buenos Aires]]
> (Provinz)
> ...
>
> When these provinces' names do not correspond to the actual titles of
> the wikipedia articles the extraction of the specific property fails.
> So what possibilities do we mappers have to handle that problem? Or is
> it inevitable without restricting the syntax of infoboxes?
>
> Regards,
> Bastian
>
>
>
> 2011/4/4 Paul Kreis <[email protected]>:
> > 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
> >> >>
> >> >>
> >>
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> >> >
> >>
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