AnnotationProperty

In OWL Annotation Properties are 'non-logical' properties that connect individuals, classes, ObjectProperty, other annotation properties etc with other object or with literal values. Technically, it connects the IRI of these entities.

The 'non-logical' aspect means they are ignored for reasoning purposes.

They are primarily used for metadata: labels, definitions, synonyms, attribution, notes and comments, etc.

See the OWL Primer for more details.

RO makes use of annotation properties from other ontologies (e.g. RDFS, IAO) and in addition defines annotation properties that can be used in other ontologies.

See flat list of RO annotation properties in OntoBee

Or start from a root annotation property, e.g. http://purl.obolibrary.org/obo/RO_0002416