first-order class
class whose instances are individuals and not classes
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first-order class
Summary
first-order class is a second-order class[1]. It draws 2 Wikipedia views per month (second_order_class category, ranking #42 of 44).[2]
Key Facts
- first-order class's instance of is recorded as second-order class[3].
- first-order class's instance of is recorded as fundamental Wikidata entity[4].
- first-order class is a type of fixed-order class[5].
- first-order class is a type of class[6].
- first-order class's Wikidata usage instructions is recorded as A first-order class in Wikidata, e.g., watercraft (Q1229765), bridge (Q12280), or human (Q5), is a class none of whose instances can be classes. Classes that are a subclass of (P279) a first-order class are implicitly a first-order class, e.g., submarine (Q2811) is implicitly a first order class because it is a subclass of (P279) of (a subclass of) watercraft (Q1229765). There are many classes in Wikidata whose instances cannot be classes. It is only necessary to state that such a class is an instance of (P31) first-order class (Q104086571) to emphasize this point, particularly to distinguish it from a related second-order class, such as to distinguish between watercraft (Q1229765) and watercraft type (Q16335899). Before stating that a class is an instance of (P31) first-order class (Q104086571), double check that it cannot have any instances that are classes.[7].
- first-order class's maintained by WikiProject is recorded as WikiProject Ontology[8].
Body
Definition and Type
Recorded instance of include second-order class[3] and fundamental Wikidata entity[4]. Recorded subclass of include fixed-order class[5] and class[6].
Why It Matters
first-order class draws 2 Wikipedia views per month (second_order_class category, ranking #42 of 44).[2] It is known by 65 alternative names across languages and contexts.[9]