Help:Type Annotation URI

The datatype Annotation URI is a variant of. It is used in cases where a URL property needs to be exported as an owl:AnnotationProperty which is the case almost exclusively for imported properties.CiteRef::w3.org:tr:owl2-primer:8

Intuitively these properties (owl:AnnotationProperty) play a role that is similar to a comment or meta-property – something that does not have a direct meaning to the topic, but that may provide additional technical information. The type Annotation URI should thus be used very rarely. A typical example is a property which specifies the URI of an additional source of information on the subject.

introduced setting the list of permissive permissive URI schemes for data values to allow for better validation.