1) Consider http://mappings.dbpedia.org/index.php/OntologyProperty:FirstAscent:
it specifies `rdfs:domain Mountain, Volcano`.
The author of that mapping probably thought this means that the property
`firstAscent` should apply to `Mountain` or `Volcano`.
But by RDFS semantics, when you specify multiple classes as domain/range for a
property, then every subject/object of a property is inferred to have all these
classes. Eg in the above case, any subject will be inferred to be both
`Mountain` and `Volcano`.
Furthermore, the ontology generator doesn't emit two classes, but one invalid
class URI:
```
dbo:firstAscent rdfs:domain http://dbpedia.org/ontology/Mountain,Volcano ;
```
2) Some subProperty statements have an object spelt in Uppercase.
- in some cases this leads to a statement that does not connect to the intended
property (in this case dbo:medalist), e.g.:
```
dbo:silverMedalist rdfs:subPropertyOf dbo:Medalist
```
- in other cases it leads to a statement which links to a class, which is a
mistake
```
dbo:senator rdfs:subPropertyOf dbo:MemberOfParliament .
```
Out of 62 subProperty declarations, 20 have this problem:
dbo:bronzeMedalist rdfs:subPropertyOf dbo:Medalist .
dbo:codeLandRegistry rdfs:subPropertyOf dbo:Code .
dbo:codeMemorial rdfs:subPropertyOf dbo:Code .
dbo:distanceToCapital rdfs:subPropertyOf dbo:Distance .
dbo:dutchMIPCode rdfs:subPropertyOf dbo:Code .
dbo:goldMedalist rdfs:subPropertyOf dbo:Medalist .
dbo:iso6391Code rdfs:subPropertyOf dbo:LanguageCode .
dbo:iso6392Code rdfs:subPropertyOf dbo:LanguageCode .
dbo:iso6393Code rdfs:subPropertyOf dbo:LanguageCode .
dbo:musicalKey rdfs:subPropertyOf dbo:Type .
dbo:officialSchoolColour rdfs:subPropertyOf dbo:ColourName .
dbo:otherWins rdfs:subPropertyOf dbo:Wins .
dbo:politicGovernmentDepartment rdfs:subPropertyOf dbo:Department .
dbo:protectionStatus rdfs:subPropertyOf dbo:Status .
dbo:rankingWins rdfs:subPropertyOf dbo:Wins .
dbo:senator rdfs:subPropertyOf dbo:MemberOfParliament .
dbo:silCode rdfs:subPropertyOf dbo:LanguageCode .
dbo:silverMedalist rdfs:subPropertyOf dbo:Medalist .
dbo:subTribus rdfs:subPropertyOf dbo:Tribus .
dbo:superTribus rdfs:subPropertyOf dbo:Tribus .
3) I'm not sure whether it's a good idea to have classes and properties that
have the same name, except capitalization.
The mapping wiki uppercases properties, e.g.
http://mappings.dbpedia.org/index.php/OntologyClass:MemberOfParliament
http://mappings.dbpedia.org/index.php/OntologyProperty:MemberOfParliament
So the difference between these two is lost on people.
There are 152 terms with duplicate names (see attachment).
But I don't imagine it's feasible to change all these now...
---
Posted as https://github.com/dbpedia/extraction-framework/issues/287 :
Would be nice if the mapping wiki and/or the ontology generator checks this:
- no commas in domain/range
- internal subPropertyOf are lowercase
- internal subPropertyOf and subClassOf actually exist
--
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