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- Metaclass_(Semantic_Web) abstract "In the Semantic Web, a metaclass is a class whose instances are classes. Metaclasses are supported in the ontology language OWL and the data-modeling vocabulary RDFS. Similar to their role in programming languages, metaclasses in Semantic Web languages can have properties otherwise applicable only to individuals, while retaining the same class's ability to be classified in a concept hierarchy. This enables knowledge about instances of those metaclasses to be inferred by semantic reasoners using statements made in the metaclass. Metaclasses thus enhance the expressivity of knowledge representations in a way that can be intuitive for users. While classes are suitable to represent a population of individuals, metaclasses can, as one of their feature, be used to represent the conceptual dimension of an ontology.Metaclasses are often modeled by setting them as the object of claims involving rdf:type and rdfs:subClassOf—built-in properties commonly referred to as instance of and subclass of. Instance of entails that the subject of the claim is an instance, i.e. an individual that is a member of a class. Subclass of entails that the subject is a class. In the context of instance of and subclass of, ordinary can be are the object of instance of claims used on a class, but ordinary classes are not. (where in a claim Bob instance of Human, Bob is the subject, and Human the object).OWL 2 DL supports metaclasses by a feature called punning, in which one entity is interpreted as two different types of thing—a class and an individual—depending on its syntactic context. For example, through punning, an ontology could have a concept hierarchy such as Harry the eagle instance of golden eagle, golden eagle subclass of bird, and golden eagle instance of species. In this case, the punned entity would be golden eagle, because it is represented as a class (second claim) and an instance (third claim); whereas the metaclass would be species, as it has an instance that is a class. Punning also enables other properties that would otherwise be applicable only to ordinary instances to be used directly on classes, for example "golden eagle conservation status least concern."Having arisen from the fields of knowledge representation, description logic and formal ontology, Semantic Web languages have a closer relationship to philosophical ontology than do conventional programming languages such as Java or Python. Accordingly, the nature of metaclasses is informed by philosophical notions such as abstract objects, the abstract and concrete, and type-token distinction. Metaclasses permit concepts to be construed as tokens of other concepts while retaining their ontological status as types. This enables types to be enumerated over, while preserving the ability to inherit from types. For example, metaclasses could allow a machine reasoner to infer from a human-friendly ontology how many elements are in the periodic table, or, given that number of protons is a property of chemical element and isotopes are a subclass of elements, how many protons exist in the isotope hydrogen-2.".
- Metaclass_(Semantic_Web) wikiPageID "45605876".
- Metaclass_(Semantic_Web) wikiPageLength "10722".
- Metaclass_(Semantic_Web) wikiPageOutDegree "52".
- Metaclass_(Semantic_Web) wikiPageRevisionID "678322625".
- Metaclass_(Semantic_Web) wikiPageWikiLink Abraham_Lincoln.
- Metaclass_(Semantic_Web) wikiPageWikiLink Abstract_and_concrete.
- Metaclass_(Semantic_Web) wikiPageWikiLink Abstract_objects.
- Metaclass_(Semantic_Web) wikiPageWikiLink Atom.
- Metaclass_(Semantic_Web) wikiPageWikiLink Atomic_number.
- Metaclass_(Semantic_Web) wikiPageWikiLink Category:Ontology_languages.
- Metaclass_(Semantic_Web) wikiPageWikiLink Category:Resource_Description_Framework.
- Metaclass_(Semantic_Web) wikiPageWikiLink Category:Web_Ontology_Language.
- Metaclass_(Semantic_Web) wikiPageWikiLink Chemical_element.
- Metaclass_(Semantic_Web) wikiPageWikiLink Chemical_elements.
- Metaclass_(Semantic_Web) wikiPageWikiLink Description_logic.
- Metaclass_(Semantic_Web) wikiPageWikiLink Deuterium.
- Metaclass_(Semantic_Web) wikiPageWikiLink Formal_ontology.
- Metaclass_(Semantic_Web) wikiPageWikiLink Hierarchy.
- Metaclass_(Semantic_Web) wikiPageWikiLink Hydrogen.
- Metaclass_(Semantic_Web) wikiPageWikiLink Instance_(computer_science).
- Metaclass_(Semantic_Web) wikiPageWikiLink Is-a.
- Metaclass_(Semantic_Web) wikiPageWikiLink Isotope.
- Metaclass_(Semantic_Web) wikiPageWikiLink Java_(programming_language).
- Metaclass_(Semantic_Web) wikiPageWikiLink Knowledge_representation.
- Metaclass_(Semantic_Web) wikiPageWikiLink Knowledge_representation_and_reasoning.
- Metaclass_(Semantic_Web) wikiPageWikiLink Least-concern_species.
- Metaclass_(Semantic_Web) wikiPageWikiLink Least_concern.
- Metaclass_(Semantic_Web) wikiPageWikiLink Mars.
- Metaclass_(Semantic_Web) wikiPageWikiLink Metaclass.
- Metaclass_(Semantic_Web) wikiPageWikiLink Metamodel.
- Metaclass_(Semantic_Web) wikiPageWikiLink Metamodeling.
- Metaclass_(Semantic_Web) wikiPageWikiLink Nuclide.
- Metaclass_(Semantic_Web) wikiPageWikiLink Ontologies.
- Metaclass_(Semantic_Web) wikiPageWikiLink Ontology.
- Metaclass_(Semantic_Web) wikiPageWikiLink Ontology_(information_science).
- Metaclass_(Semantic_Web) wikiPageWikiLink Periodic_table.
- Metaclass_(Semantic_Web) wikiPageWikiLink Protégé_(software).
- Metaclass_(Semantic_Web) wikiPageWikiLink Pun.
- Metaclass_(Semantic_Web) wikiPageWikiLink Python_(programming_language).
- Metaclass_(Semantic_Web) wikiPageWikiLink RDFS.
- Metaclass_(Semantic_Web) wikiPageWikiLink RDF_Schema.
- Metaclass_(Semantic_Web) wikiPageWikiLink Reflexive_relation.
- Metaclass_(Semantic_Web) wikiPageWikiLink Resource_Description_Framework.
- Metaclass_(Semantic_Web) wikiPageWikiLink Semantic_Web.
- Metaclass_(Semantic_Web) wikiPageWikiLink Semantic_reasoner.
- Metaclass_(Semantic_Web) wikiPageWikiLink Semantic_reasoners.
- Metaclass_(Semantic_Web) wikiPageWikiLink Species.
- Metaclass_(Semantic_Web) wikiPageWikiLink Taxonomy_(general).
- Metaclass_(Semantic_Web) wikiPageWikiLink Type-token_distinction.
- Metaclass_(Semantic_Web) wikiPageWikiLink Type–token_distinction.
- Metaclass_(Semantic_Web) wikiPageWikiLink Web_Ontology_Language.
- Metaclass_(Semantic_Web) wikiPageWikiLinkText "Metaclass (Semantic Web)".
- Metaclass_(Semantic_Web) hasPhotoCollection Metaclass_(Semantic_Web).
- Metaclass_(Semantic_Web) wikiPageUsesTemplate Template:Multiple_issues.
- Metaclass_(Semantic_Web) wikiPageUsesTemplate Template:Reflist.
- Metaclass_(Semantic_Web) subject Category:Ontology_languages.
- Metaclass_(Semantic_Web) subject Category:Resource_Description_Framework.
- Metaclass_(Semantic_Web) subject Category:Web_Ontology_Language.
- Metaclass_(Semantic_Web) hypernym Class.
- Metaclass_(Semantic_Web) comment "In the Semantic Web, a metaclass is a class whose instances are classes. Metaclasses are supported in the ontology language OWL and the data-modeling vocabulary RDFS. Similar to their role in programming languages, metaclasses in Semantic Web languages can have properties otherwise applicable only to individuals, while retaining the same class's ability to be classified in a concept hierarchy.".
- Metaclass_(Semantic_Web) label "Metaclass (Semantic Web)".
- Metaclass_(Semantic_Web) sameAs Métaclasse_(web_sémantique).
- Metaclass_(Semantic_Web) sameAs m.012zl948.
- Metaclass_(Semantic_Web) sameAs Q19478619.
- Metaclass_(Semantic_Web) sameAs Q19478619.
- Metaclass_(Semantic_Web) wasDerivedFrom Metaclass_(Semantic_Web)?oldid=678322625.
- Metaclass_(Semantic_Web) isPrimaryTopicOf Metaclass_(Semantic_Web).