Base Metrics
Base Metrics comprise of simple metrics, like the counting of classes, axioms, objects etc. So it shows the quantity of ontology elements. For these Metrics we chose:
Contents
Axiom
Axioms, regarding OntoMetrics, are relations between classes, it could descibe cardinality, value range or default-values of relations and attributes. It is also able to describe characteristics of relations like symmetry or transitivity.
Logical axiom
These special kind of axioms are universally valid.
Class
Classes in ontologies are concepts. These classes can contain other classes or individuals. In OWL there a generally 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.
Total class
Individuals
Individuals are the instances of the classes. This metric counts these instances, one class could have a set of instances.
Total Individual
Property
In OWL there are two types of properties:
Object property
Object properties link individuals to individuals.
Total Object property
Data property count
Other then the Object properties the Data properties link individuals to data values
