second-order class

Summary

second-order class is a third-order class^[1]. It is known by 67 alternative names across languages and contexts.^[2]

Key Facts

• second-order class's instance of is recorded as third-order class^[3].
• second-order class's instance of is recorded as fundamental Wikidata entity^[4].
• second-order class is a type of fixed-order class^[5].
• second-order class is a type of metaclass^[6].
• second-order class's equivalent class is recorded as http://sw.opencyc.org/2012/05/10/concept/en/FirstOrderCollection^[7].
• second-order class's different from is recorded as type^[8].
• second-order class's different from is recorded as metaclass^[9].
• second-order class's different from is recorded as class^[10].
• second-order class's different from is recorded as variable-order class^[11].
• second-order class's properties for this type is recorded as P1963^[12].
• second-order class's properties for this type is recorded as P6104^[13].
• second-order class's properties for this type is recorded as P8225^[14].
• second-order class's properties for this type is recorded as P2737^[15].
• second-order class's Wikidata usage instructions is recorded as Wikidata:WikiProject Ontology/Modelling^[16].
• second-order class's Wikidata usage instructions is recorded as A second-order class in Wikidata, e.g., watercraft type (Q16335899), bridge by structural type (Q17644823), or first-order class (Q104086571), is a class all of whose instances are implicitly or explicitly an instance of (P31) first-order class (Q104086571). A class is implicitly a second-order classes if it is a subclass of (P279) another class that is a second-order class, e.g., submarine type (Q121289744) is implicitly a second order class because it is a subclass of (P279) watercraft type (Q16335899). These implicit instance of instance of (P31) statements are not all observable in Wikidata. Before stating that a class is an instance of (P31) second-order class (Q24017414) check that it is actually a second-order class, i.e., that all its instances are classes of individuals.^[17].
• second-order class's model item is recorded as cell type^[18].
• second-order class's maintained by WikiProject is recorded as WikiProject Ontology^[19].
• second-order class's is metaclass for is recorded as first-order class^[20].

Body

Definition and Type

Recorded instance of include third-order class^[3] and fundamental Wikidata entity^[4]. Recorded subclass of include fixed-order class^[5] and metaclass^[6].

Why It Matters

second-order class is known by 67 alternative names across languages and contexts.^[2]