<http://52.38.26.42:8080/role_type/principal_author> <http://purl.org/dc/terms/identifier> "principal_author" .
<http://52.38.26.42:8080/role_type/principal_author> <http://www.w3.org/2000/01/rdf-schema#label> "Principal Author" .
<http://52.38.26.42:8080/role_type/principal_author> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Role> .