メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.851587438966 35.1009908612746, 138.851125709259 35.1010356534729, 138.850653681926 35.1010826570341, 138.849697150848 35.1011703562225, 138.849573628864 35.1004153741222, 138.850505404758 35.1002723203939, 138.851001849366 35.1001901734437, 138.851436272299 35.1001182755622, 138.851587438966 35.1009908612746)) ^^http://www.opengis.net/ont/geosparql#wktLiteral