Individual	An individual is an instance of one or more classes.
Class	A class represents a concept and is a set with multiple inheritance and properties.
Datatype	 
Root	 
DatatypeProperty	A property that relates objects to datatype values.
ObjectProperty	A property that relates objects to other objects.
TransitiveProperty	A property that is transitive. A TransitiveProperty is a subclass of ObjectProperty.
UnambiguousProperty	A property that an instance y can only be the value of a Property P for a single instance x.
UniqueProperty	A property that can only have one (unique) value y for each instance x.