http://www.geneontology.org/formats/oboInOwl#external_ontology
owl:AnnotationProperty
@prefix oboInOwl: <http://www.geneontology.org/formats/oboInOwl#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
oboInOwl:external_ontology a owl:AnnotationProperty .