never in taxon never_in_taxon true true never_in_taxon Class: <http://www.w3.org/2002/07/owl#Nothing> EquivalentTo: ?X and (RO_0002162 some ?Y) ?X DisjointWith RO_0002162 some ?Y PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX in_taxon: <http://purl.obolibrary.org/obo/RO_0002162> PREFIX never_in_taxon: <http://purl.obolibrary.org/obo/RO_0002161> CONSTRUCT { in_taxon: a owl:ObjectProperty . a owl:Restriction ; owl:onProperty in_taxon: ; owl:someValuesFrom ?taxon ] . ?x rdfs:subClassOf [ a owl:Restriction ; owl:onProperty in_taxon: ; owl:someValuesFrom [ a owl:Class ; owl:complementOf ?taxon ] ] . } WHERE { ?x never_in_taxon: ?taxon . } never_in_taxon x never in taxon T if and only if T is a class, and x does not instantiate the class expression "in taxon some T". Note that this is a shortcut relation, and should be used as a hasValue restriction in OWL. RO:0002161 Chris Mungall Class: ?X DisjointWith: RO_0002162 some ?Y S never_in_taxon T iff: S SubClassOf in_taxon only not T. tooth SubClassOf 'never in taxon' value 'Aves' uberon taxonomic class assertion