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AlternativeOrganizationProposalReqDraft
From OWL
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- Document title:
- OWL 2 Web Ontology Language
RequirementsBla (Second Edition)
1 Requirements
1.1 Disjoint Union
- Requirement
- While OWL provides means to define a set of subclasses as a disjoint and complete covering, this cannot be done concisely. This is a shortcoming given the common use of such constructs in domain models.
- Use Cases
- Use Case #1 Use Case #4
- Feature
- DisjointUnion defines a class as the union of other classes, all of which are pair-wise disjoint. It is a shorthand for owl:disjointWith statements used in combination with owl:unionOf to define a complete superclass from a set of mutually disjoint subclasses.
- Grammar
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- DisjointUnion := 'DisjointUnion' '(' { Annotation } Class ClassExpression ClassExpression { ClassExpression } ')'
- Theoretical Perspective
- Since DisjointUnion is simply a shorthand for several disjointWith statements in combination with unionOf, it does not change the expressiveness, semantics, or complexity of the language.
- Implementation Perspective
- Being syntactic sugar, it's possible to take an ontology that is OWL 1 except for DisjointUnion and preprocess it into an equivalent OWL 1 ontology without DisjointUnion. Implementations, however, may prefer to take special notices of DisjointUnion for more efficient loading reasons.
| DisjointUnion(BrainHemisphere LeftHemisphere RightHemisphere ) (Ax1) | A brain hemisphere is either a left hemisphere or a right hemisphere. |
| DisjointUnion(Lobe FrontalLobe ParietalLobe TemporalLobe OccipitalLobe LimbicLobe) (Ax2) | A lobe is one of the following types: frontal, parietal, temporal, occipital, limbic. |
| DisjointUnion(Cell NucleatedCell NonNucleatedCell) (Ax3) | A Cell is either a nucleated cell or a non-nucleated cell, and cannot be at the same time nucleated and non-nucleated. |
| DisjointUnion(CarDoor FrontDoor RearDoor TrunkDoor) (Ax4) | A car can have only front doors, rear doors and a trunk door. |