Darwin Core term name: relatedResourceID. An identifier for a related resource (the object, rather than the subject of the relationship). This property is currently not used.

Darwin Core term name: relationshipAccordingTo. The source (person, organization, publication, reference) establishing the relationship between the two resources. This property is currently not used.

Darwin Core term name: relationshipEstablishedDate. The date-time on which the relationship between the two resources was established. Recommended best practice is to use an encoding scheme, such as ISO 8601:2004(E). This property is currently not used.

Darwin Core term name: RelationshipOfResource. The relationship of the resource identified by relatedResourceID to the subject (optionally identified by the resourceID). Recommended best practice is to use a controlled vocabulary. This property is currently not used.

Darwin Core term name: relationshipRemarks. Comments or notes about the relationship between the two resources. This property is currently not used.

Darwin Core term name: resourceID. An identifier for the resource that is the subject of the relationship. This property is currently not used.

Darwin Core term name: resourceRelationshipID. An identifier for an instance of relationship between one resource (the subject) and another (relatedResource, the object). This property is currently not used.