Hello Bernard,
your analysis is awesome! i learned much from this post, thanks
On Fri, Oct 23, 2009 at 6:45 AM, Bernard Vatant
<[email protected]>wrote:
> Hello Kenny
>
> I'll try to show that your question can have different levels of answer
> depending on interpretation, all of them based on SPARQL queries altogether.
>
> As others have suggested, you can query the ontology level for properties
> of which Company class is the domain, by submitting the following at
> http://dbpedia.org/sparql
>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> SELECT DISTINCT ?p
> WHERE {?p rdfs:domain <http://dbpedia.org/ontology/Company>}
>
> This gets the following list of properties.
>
> http://dbpedia.org/ontology/locationcity
> http://dbpedia.org/ontology/assets
> http://dbpedia.org/ontology/equity
> http://dbpedia.org/ontology/industry
> http://dbpedia.org/ontology/products
> http://dbpedia.org/ontology/services
> http://dbpedia.org/ontology/subsid
> http://dbpedia.org/ontology/areaServed
> http://dbpedia.org/ontology/divisions
> http://dbpedia.org/ontology/footnotes
> http://dbpedia.org/ontology/locationcountry
> http://dbpedia.org/ontology/marketcap
> http://dbpedia.org/ontology/netincome
> http://dbpedia.org/ontology/operatingincome
>
> This is pretty straightforward, but you get only properties directly and
> exclusively attached to Company class through the rdfs:domain declaration.
> Other properties might be inherited from Company superclasses, named or
> constructed (such as unionOf classes) or locally attached to this class
> using OWL restrictions. Not sure the latter happens in the dbpedia ontology,
> but you can e.g. query for properties of which domain is a Company
> superclass.
>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> SELECT DISTINCT ?p
> WHERE { ?p rdfs:domain ?x.
> <http://dbpedia.org/ontology/Company> rdfs:subClassOf ?x
> }
>
> And you get a few more properties
>
> http://dbpedia.org/ontology/foundationplace
> http://dbpedia.org/ontology/keyPersonPosition
> http://dbpedia.org/ontology/product
> http://dbpedia.org/ontology/foundationdate
> http://dbpedia.org/ontology/foundationorganisation
> http://dbpedia.org/ontology/keyPerson
> http://dbpedia.org/ontology/foundationperson
> http://dbpedia.org/ontology/numberOfEmployees
WHERE { ?p rdfs:domain ?x.
<http://dbpedia.org/ontology/Company> rdfs:subClassOf ?x }
will this get all properties of Company's farther classes or just one level
up in the hierarchy?
>
>
> But this is only the ontology level and one might wonder which of the above
> are actually used in DBpedia *instances*.
> To figure it out, just try the following ...
>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> SELECT DISTINCT ?p
> WHERE { ?x a <http://dbpedia.org/ontology/Company>.
> ?x ?p ?y }
>
> ... and get the surprise to find out more than 1000 different properties
> actually used to describe companies, meaning that, to paraphrase Hamlet,
> there is more in heaven and earth instances than is dreamt of in the model
> philosophy.
> Why so? Some properties in this list such as "length" are indeed weird for
> a company, so you might want to look for Companies having a length ...
>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> SELECT DISTINCT ?x ?y
> WHERE { ?x a <http://dbpedia.org/ontology/Company>.
> ?x <http://dbpedia.org/ontology/length> ?y }
>
> Among the list you find e.g., <
> http://dbpedia.org/resource/Orion_International>.
> And if you look at the description of that one, you find indeed that it has
> a length, but also a width and a height.
> Well, strange indeed, but looking further down the description you find the
> following values for rdf:type
>
> dbpedia-owl:MeanOfTransportation
> dbpedia-owl:Company
> dbpedia-owl:Resource
> dbpedia-owl:Automobile
> dbpedia-owl:Organisation
>
> It figures. If you are both Company and Automobile, strange things are
> bound to happen to you.
>
> Hoping this little excursion will help you understand better, on one hand
> the power of SPARQL, and on the other hand that DBpedia is far from being a
> consistent set of data. In an open world, the question "What properties can
> a Company have?" has no unique answer.
>
> Bernard
>
>
> 2009/10/22 Jona Christopher Sahnwaldt <[email protected]>
>
>> On Thu, Oct 22, 2009 at 16:23, Kenny Guan <[email protected]> wrote:
>> > is there an already way to retrieve properties associated with an
>> ontology
>> > class in OWL file?
>>
>> None that I'm aware of. It's should be quite simple though with
>> some XML parsing or XSLT code. First find the class and all its
>> base classes, then find all DatatypeProperty and ObjectProperty
>> elements that declare one of these classes as their domain.
>>
>> The current ontology file can be found here:
>>
>>
>> https://dbpedia.svn.sourceforge.net/svnroot/dbpedia/ontology/dbpedia_3.3.owl
>>
>> Be aware that a new version is coming up:
>>
>>
>> https://dbpedia.svn.sourceforge.net/svnroot/dbpedia/ontology/dbpedia_3.4.owl
>>
>>
>> Christopher
>>
>>
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>
>
>
> --
> Bernard Vatant
> Senior Consultant
> Vocabulary & Data Engineering
> Tel: +33 (0) 971 488 459
> Mail: [email protected]
> ----------------------------------------------------
> Mondeca
> 3, cité Nollez 75018 Paris France
> Web: http://www.mondeca.com
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> ----------------------------------------------------
>
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