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 individuals.	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).