メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.909592270285 43.496706858626, 141.908700139446 43.4968325068346, 141.908356761317 43.495725424277, 141.909315270254 43.4955935389174, 141.909327081547 43.4956317966309, 141.909654565522 43.4966919591, 141.909592270285 43.496706858626)) ^^http://www.opengis.net/ont/geosparql#wktLiteral