メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.55628272068 42.9773376025337, 141.557180912347 42.9773867146487, 141.557184886548 42.9773868791229, 141.557912950312 42.9774289076647, 141.558031617242 42.9774383452156, 141.557992928967 42.9777113515153, 141.557882996838 42.9786875281367, 141.557849601716 42.9790136667058, 141.557010078723 42.9789580922127, 141.555587999181 42.9788584711578, 141.555432116288 42.9788406463858, 141.555520351889 42.9782342165245, 141.555474152414 42.9781176773837, 141.555201839426 42.9776828514675, 141.554980356681 42.9774852824403, 141.555378624854 42.9772812743815, 141.55628272068 42.9773376025337)) ^^http://www.opengis.net/ont/geosparql#wktLiteral