Some subproperties of object property dul:hasQuality are data properties

[LorenzBuehmann]

There are some data properties defined as subproperty of dul:hasQuality which is itself defined as object property. This leads to many problems with OWL parsers and is not OWL 2 DL conform.

This is the definition of dul:hasQuality in DUL ontology:

<owl:ObjectProperty rdf:about="http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#hasQuality">
<rdfs:label xml:lang="en">has quality</rdfs:label>
<rdfs:label xml:lang="it">ha qualità</rdfs:label>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string">
A relation between entities and qualities, e.g. 'Dmitri's skin is yellowish'.
</rdfs:comment>
<rdfs:isDefinedBy rdf:resource="http://www.ontologydesignpatterns.org/ont/dul/DUL.owl"/>
<rdfs:domain rdf:resource="http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#Entity"/>
<rdfs:range rdf:resource="http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#Quality"/>
<rdfs:subPropertyOf rdf:resource="http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#associatedWith"/>
</owl:ObjectProperty>

Properties that are affected can be found by

select ?p {
?p a owl:DatatypeProperty;
rdfs:subPropertyOf <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#hasQuality> .
}

Currently there are 4 properties, namely

http://dbpedia.org/ontology/configuration
http://dbpedia.org/ontology/eyeColor
http://dbpedia.org/ontology/hairColor
http://dbpedia.org/ontology/skinColor

[LorenzBuehmann]

To have a more generic test, this also holds for other properties, see

select ?sub ?sup {
?sub a owl:DatatypeProperty;
rdfs:subPropertyOf ?sup . ?sup a owl:ObjectProperty .
}

where we get

sub	sup
http://dbpedia.org/ontology/isPartOfRoute	http://dbpedia.org/ontology/isPartOf

The problem reported in the initial comment are not contained here because the DUL ontology is not contained in the endpoint, thus, we do not know that dul:hasQuality is an object property by SPARQL.

[VladimirAlexiev]

Please also consider http://vladimiralexiev.github.io/pres/20150209-dbpedia/dbpedia-problems-long.html#sec-8-1. IMHO the DUL mappings should be a separate, optional, download file

[LorenzBuehmann]

UPDATE:
I loaded DUL into my local endpoint. Here you can see all problems where a data property is a subproperty of an object property:

sub	sup
http://dbpedia.org/ontology/configuration	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#hasQuality
http://dbpedia.org/ontology/eyeColor	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#hasQuality
http://dbpedia.org/ontology/fuelType	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#isClassifiedBy
http://dbpedia.org/ontology/hairColor	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#hasQuality
http://dbpedia.org/ontology/isPartOfRoute	http://dbpedia.org/ontology/isPartOf
http://dbpedia.org/ontology/iso6391Code	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#isClassifiedBy
http://dbpedia.org/ontology/iso6392Code	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#isClassifiedBy
http://dbpedia.org/ontology/iso6393Code	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#isClassifiedBy
http://dbpedia.org/ontology/valvetrain	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#hasComponent
http://dbpedia.org/ontology/firstAppearance	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#isParticipantIn
http://dbpedia.org/ontology/isoCodeRegion	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#isPartOf
http://dbpedia.org/ontology/languageCode	http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#sameSettingAs

[mgns]

Fixed the reported ones at least in the DBpedia mappings wiki, e.g. http://mappings.dbpedia.org/index.php?title=OntologyProperty:IsoCodeRegion

Should be fixed with next release and soon at DBpedia Live: http://mappings.dbpedia.org/server/ontology/dbpedia.owl