Base Metrics
Base Metrics comprise of simple metrics, like the counting of classes, axioms, objects etc.
So it shows the quantity of ontology elements.
The difference between the count metrics and the total count metrics is, that the total count metrics takes account of imports from other ontologies.
For these Metrics we chose:
Axiom
Axioms are basic statements of an ontology, they are used to obtain information about classes and properties. Thus they are used to connect class and property identifiers to their specification.
Class
Classes in ontologies are concepts, these classes can contain other classes or individuals. In OWL exists a Thing-Class, which is a universal class, so every user defined class is a subclass of the Thing-Class.
With this metric we count the classes, including the thing-class, to create a view on the quantity of classes.
Individuals
Individuals are the instances of the classes, so they represent the actual object. This metric counts these instances, one class is able to have a set of instances.
Property
In OWL there are two types of properties:
Object property
Object properties link individuals to individuals.
Data property
Other then the Object properties the Data properties link individuals to data values (literals).
