CODEWITHSUNDEEP
rdfsemantic-webowl
bernie2436
bernie2436

Reputation: 23931

what makes an OWL class anonymous?

I am reading a tutorial that says that this is an anonymous OWL class:

<owl:Class rdf:ID="Reptile"> 
       <rdfs:subClassOf rdf:resource="#Animal”/> 
       <rdfs:subClassOf rdf:resource="#OxygenUser”/> 
</owl :Class>

I know what an anonymous class is in Java. What makes this class anonymous in OWL? Is it anonymous because it does not have an RDFS:label statement like this: <rdfs:label>Reptile</rdfs:label> ?

Upvotes: 1

Views: 1179

Answers (2)

Ian Dickinson
Ian Dickinson

Reputation: 13315

Do you have a source URL for the tutorial? The example you quote does not contain any anonymous classes, so if that's a direct quote from the tutorial, it's giving out wrong information.

Upvotes: 0

loopasam
loopasam

Reputation: 3146

OWL anonymous classes are classes without a name/identifier (URI). Usually it's an OWL class expression such as eats some Grass or Male and Female. You use such expression in combination with named classes to create axioms.

Example of equivalent classes axioms using both named an anonymous classes (comments are shown by the # symbol):

# Named class (got a dereferencable URI)
Class: <http://www.example.org/Man>

# Named Class
Class: <http://www.example.org/Woman>

# Named class
Class: <http://www.example.org/Human>

    # The named class Human is equivalent 
    # to the anonymous class (class expression) Man or Woman
    EquivalentTo: <http://www.example.org/Man> or <http://www.example.org/Woman>

Upvotes: 3

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