With Cardinality Restriction one has the Ability to restrict Properties according the Number they should apply. The
owl:cardinality restricts to an exact number. On the other hand one can set upper and lower bounds with the help of
For example on can define a Stringquartett by stating that a Stringquartett always has exactly four Members. This can be defined in OWL by stating a Stringquartett is an Class which is a subclass of a Restriction where one has
owl:Restriction on the Property
:hasMembers and one states that the exact members are number that one restricts as four.
owl:cardinalityrestricts to an exact number (for OWL Lite only 1/0)
restricts to upper/lower bounds
Stringquartett ⊑ (=4)hasMembers
:hasMembers a owl:DatatypeProperty ; rdfs:domain :Thing ; rdfs:range xsd:integer .