Wikidata entity: Q104086571
| P31 | instance of | ... | Q24017414 (second-order class) | second-order class |
| P6104 | maintained by WikiProject | ... | Q60005226 (WikiProject Ontology) | WikiProject Ontology |
| P279 | subclass of | ... | Q16889133 (class) | class |
| P279 | subclass of | ... | Q23959932 (fixed-order class) | fixed-order class |
| P2559 | Wikidata usage instructions | Monolingualtext | 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. | ??? |
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