Difference between revisions of "Base Metrics"
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Base Metrics comprise of simple metrics, like the counting of classes, axioms, objects etc. | Base Metrics comprise of simple metrics, like the counting of classes, axioms, objects etc. | ||
So it shows the quantity of ontology elements. | So it shows the quantity of ontology elements. | ||
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| + | 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: | For these Metrics we chose: | ||
==Axiom== | ==Axiom== | ||
Axioms are basics statements of an ontology, they are used to obtain information about classes and properties. | Axioms are basics statements of an ontology, they are used to obtain information about classes and properties. | ||
Thus they are used to connect classes and properties identifiers to their specification. | Thus they are used to connect classes and properties identifiers to their specification. | ||
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==Class== | ==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. | ||
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==Individuals== | ==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, so they represent the actual object. |
| − | + | This metric counts these instances, one class could have a set of instances. | |
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[[Object_Property_Axioms|Object properties]] link individuals to individuals. | [[Object_Property_Axioms|Object properties]] link individuals to individuals. | ||
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===Data property count=== | ===Data property count=== | ||
| − | Other then the Object properties the [[Data_Property_Axioms|Data properties]] link individuals to data values | + | Other then the Object properties the [[Data_Property_Axioms|Data properties]] link individuals to data values (literals). |
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==Sources== | ==Sources== | ||
Revision as of 20:45, 15 June 2016
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:
Contents
Axiom
Axioms are basics statements of an ontology, they are used to obtain information about classes and properties. Thus they are used to connect classes and properties identifiers to their specification.
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.
Individuals
Individuals are the instances of the classes, so they represent the actual object. This metric counts these instances, one class could have a set of instances.
Property
In OWL there are two types of properties:
Object property
Object properties link individuals to individuals.
Data property count
Other then the Object properties the Data properties link individuals to data values (literals).
