メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.651541861615 42.8286971935206, 141.650877451784 42.8292730469028, 141.649950281795 42.8286662767303, 141.650447727753 42.8282470991484, 141.65104095955 42.8277388873449, 141.651603866545 42.8272628667018, 141.652171450437 42.8267915087274, 141.652667160146 42.8263906681988, 141.652974911025 42.8267744650377, 141.653344781287 42.8272367964896, 141.652765076686 42.8276924120929, 141.651541861615 42.8286971935206)) ^^http://www.opengis.net/ont/geosparql#wktLiteral