class
collection of items in an ontology defined by common characteristics
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Summary
class is a metaclass[1]. class draws 76 Wikipedia views per month (metaclass category, ranking #58 of 61).[2]
Key Facts
- Instance of: variable-order class[3], concept[4], fundamental Wikidata entity[5]
- Subclass of: class[6]
- Has use: ontology[7]
- Said to be the same as: class[8]
- Opposite of: concrete object[9]
- Has part(s): entity[10]
- Has cause: classification[11]
- Described at URL: https://perso.liris.cnrs.fr/alain.mille/enseignements/Ecole_Centrale/What%20is%20an%20ontology%20and%20why%20we%20need%20it.htm[12], https://tomgruber.org/writing/onto-design.pdf[13], https://www.wikidata.org/wiki/Wikidata:WikiProject_Ontology/Modelling[14]
- Facet of: ontology[15], ontology language[16], classification scheme[17]
- Described by source: World Wide Web Consortium[18]
- Has characteristic: criterion[19]
- Main Wikidata property: P2308[20]
- Native label: concept[21]
- Equivalent class: https://meta.schema.org/Class[22], https://id.oclc.org/worldcat/entity/Q38[23], http://www.w3.org/2002/07/owl#Class[24], http://www.w3.org/2000/01/rdf-schema#Class[25]
- Different from: Class[26], Concept[27], Třída[28], collection[29], group[30], set[31], second-order class[32]
- Properties for this type: P2670[33]
- Wikidata usage instructions: A class in Wikidata, e.g., human (Q5), watercraft (Q1229765), watercraft type (Q16335899), or class (Q16889133) itself, is an entity that can have other entities that are an instance of (P31) of it. A class thus can have other classes that are a subclass of (P279) of it. All classes are implicitly an instance of (P31) class (Q16889133). These implicit instance of (P31) statements are not all observable in Wikidata. Only a very few classes should be be explicitly an instance of (P31) or a subclass of (P279) class (Q16889133). For any regular class, including metaclasses, the implicit relationship suffices even if there is no other class that can be found for the class to be an instance of (P31) or subclass of (P279). Most classes are fixed-order classes, e.g., human (Q5) whose instances are all individuals or ship type (Q2235308) whose instances are all classes of individuals,and can be explicitly stated to be an instance of (P31) the fixed-order class, here first-order class (Q104086571) and second-order class (Q24017414), respectively.[34]
- Studied by: ontology[35]
- Disjoint union of: list of values as qualifiers[36]
- Exact match: https://meta.schema.org/Class[37], https://www.w3.org/TR/owl-ref/#Class[38]
- Model item: variable-order class[39], fixed-order class[40]
- Maintained by WikiProject: WikiProject Ontology[41]
Why It Matters
class is known by 100 alternative names across languages and contexts.[42]