Table 3.
An outline of metrics and with their respective counts in the COVID-19 ontology modeled in this study.
| Metrics | Number of items | Description |
|---|---|---|
| Classes | 179 | sets, collections, concepts, types of objects or things |
| Class axiom | 169 | Class-based statements that are asserted to be true in the domain being described: e.g Subclass, Equivalent class, Disjoint class |
| Individuals | 592 | An instance of a class |
| Individuals (Object property assertion) | 545 | Statements made using object properties and individuals |
| Individuals (Data property assertion) | 1080 | Statements made using data properties and individuals |
| Individuals (Class assertion) | 1040 | Statements of individuals assigned to a class |
| Object property axiom (Object property domain/range) | 13/13 | Statements made by stating the domain and range of an object property |
| Date property axiom (Object property domain/range) | 23/23 | Statements made by stating the domain and range of an object property |
| Properties | 37 | Represent characteristics of the things that have been described as classes |
| Maximum depth | 4 | The farthest route from the Thing class to a leaf class |
| Disjoint classes | 8 | Classes that cannot share an instance |
| Maximum number of children | 47 | |
| Average number of Children | 14.6 | Computational value of finding the average number of children immediate subclasses of the Thing class |
| Classes with a single child | 0 | |
| Classes with more than 25 children | 4 | |
| Annotation | 2 | Comments on entities in an ontology |
| Axiom | 3731 | Statements asserted as a priori knowledge |
| Logical axiom count | 2915 | Axioms that forms the logical definition of terms |
| Object Property | 13 | Properties used to characterize classes |
| Data Property | 24 | Properties used to characterize the relationship between classes and data-values |
| Subclass of | 169 | a subdivision of a class |