Difference between revisions of "Base Metrics"
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So it shows the quantity of ontology elements. | So it shows the quantity of ontology elements. | ||
For these Metrics we chose: | For these Metrics we chose: | ||
| − | ==Axiom | + | ==Axiom== |
Axioms, regarding OntoMetrics, are relations between classes, it could descibe cardinality, value range or default-values of relations and attributes. | 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. | It is also able to describe characteristics of relations like symmetry or transitivity. | ||
| − | ==Logical axiom | + | ==Logical axiom == |
These special kind of axioms are universally valid. | These special kind of axioms are universally valid. | ||
| − | ==Class | + | ==Class== |
Classes in ontologies are concepts. These classes can contain other classes or individuals. | 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 | 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 | ||
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With this metric we count the classes, including the thing-class, to create a view on the quantity of classes. | With this metric we count the classes, including the thing-class, to create a view on the quantity of classes. | ||
| − | ===Total class | + | ===Total class=== |
| − | == | + | ==Individuals== |
Individuals are the instances of the classes. This metric counts these instances, one class could have a set of instances. | Individuals are the instances of the classes. This metric counts these instances, one class could have a set of instances. | ||
| − | ===Total Individual | + | ===Total Individual=== |
| − | ==Property | + | ==Property== |
In OWL there are two types of properties: | In OWL there are two types of properties: | ||
| − | ===Object property | + | ===Object property=== |
Object properties link individuals to individuals. | Object properties link individuals to individuals. | ||
| − | ====Total Object property | + | ====Total Object property==== |
===Data property count=== | ===Data property count=== | ||
Other then the Object properties the Data properties link individuals to data values | Other then the Object properties the Data properties link individuals to data values | ||
| − | ====Total data property | + | ====Total data property==== |
Revision as of 10:53, 13 June 2016
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
