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The logical building blocks of OWL

Here we briefly list the building blocks that are used in OWL that enable reasoning.

OWL Semantics Example
instance or individual A member of a set. A person called Mary or a dog called Fido.
class A set of in dividuals. The Person class consisting of persons or the Dog class consisting of dogs.
object property A set of pairs of individuals. The owns object property can link a pet and its owner: Mary owns Fido.
data property A set of pairs where each pair consists of an individual linked to a data value. The data property hasAge can link a number representing an age to an individual: hasAge(Mary, 10).