Entities and Primitives
Entities represent the named terms of OWL ontologies, and are modeled by CowlEntity.
The term primitive has no correspondence in the OWL 2 specification.
It is used as a collective term for entities, anonymous individuals, and IRIs,
which are modeled by CowlPrimitive. You can always safely cast CowlEntity
to CowlPrimitive, while the opposite can only be done after checking that the primitive
is an OWL entity (see CowlPrimitive::cowl_primitive_is_entity()).
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struct CowlEntity : public CowlPrimitive
Represents an Entity in the OWL 2 specification.
Subclassed by CowlAnnotProp, CowlClass, CowlDataProp, CowlDatatype, CowlNamedInd, CowlObjProp
Public Functions
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CowlEntityType cowl_entity_get_type(CowlAnyEntity *entity)
Gets the type of the entity.
- Parameters
entity – The entity.
- Returns
The type.
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CowlIRI *cowl_entity_get_iri(CowlAnyEntity *entity)
Gets the IRI of the entity.
- Parameters
entity – The entity.
- Returns
The IRI.
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bool cowl_entity_is_reserved(CowlAnyEntity *entity)
Checks whether the entity is reserved, i.e.
if its IRI is in the reserved vocabulary.
- Parameters
entity – The entity.
- Returns
True if the entity is reserved, false otherwise.
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ulib_uint cowl_entity_get_id(CowlAnyEntity *entity)
Gets the increasing unique identifier associated to the specified entity.
Note
Only available if COWL_ENTITY_IDS is defined. Enabling this API ensures entities are tracked and given a numeric identifier for the lifetime of the executable, which can be a useful property to have in some applications. Bear in mind that this also means entities are never deallocated, which can affect memory usage.
- Parameters
entity – The entity.
- Returns
Unique identifier.
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CowlAnyEntity *cowl_entity_with_id(ulib_uint id)
Returns the entity that has the specified identifier.
See also
Note
Only available if COWL_ENTITY_IDS is defined.
- Parameters
id – Unique identifier.
- Returns
Entity with the specified identifier, or NULL if no entity has the specified identifier.
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CowlEntityType cowl_entity_get_type(CowlAnyEntity *entity)
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enum CowlEntityType
Represents the type of CowlEntity.
Values:
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enumerator COWL_ET_OBJ_PROP
CowlObjProp - object property.
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enumerator COWL_ET_DATA_PROP
CowlDataProp - data property.
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enumerator COWL_ET_ANNOT_PROP
CowlAnnotProp - annotation property.
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enumerator COWL_ET_NAMED_IND
CowlNamedInd - named individual.
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enumerator COWL_ET_DATATYPE
CowlDatatype - datatype.
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enumerator COWL_ET_COUNT
Number of enum values.
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enumerator COWL_ET_FIRST
First enum value.
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enumerator COWL_ET_OBJ_PROP
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struct CowlPrimitive : public CowlObject
Represents a primitive, a collective term for entities, anonymous individuals, and IRIs.
Subclassed by CowlAnonInd, CowlEntity, CowlIndividual
Public Functions
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CowlPrimitiveType cowl_primitive_get_type(CowlAnyPrimitive *primitive)
Gets the type of the primitive.
- Parameters
primitive – The primitive.
- Returns
The type.
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bool cowl_primitive_is_entity(CowlAnyPrimitive *primitive)
Checks whether the primitive is an entity.
- Parameters
primitive – The primitive.
- Returns
True if the primitive is an entity,
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CowlPrimitiveType cowl_primitive_get_type(CowlAnyPrimitive *primitive)
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enum CowlPrimitiveType
Represents the type of CowlPrimitive.
Values:
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enumerator COWL_PT_OBJ_PROP
CowlObjProp - object property.
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enumerator COWL_PT_DATA_PROP
CowlDataProp - data property.
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enumerator COWL_PT_ANNOT_PROP
CowlAnnotProp - annotation property.
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enumerator COWL_PT_NAMED_IND
CowlNamedInd - named individual.
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enumerator COWL_PT_ANON_IND
CowlAnonInd - anonymous individual.
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enumerator COWL_PT_DATATYPE
CowlDatatype - datatype.
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enumerator COWL_PT_COUNT
Number of enum values.
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enumerator COWL_PT_FIRST
First enum value.
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enumerator COWL_PT_OBJ_PROP