メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.044290840306 42.9179844524745, 143.042090946089 42.9178438781816, 143.042280606406 42.9165147694201, 143.044461631415 42.9166537830301, 143.044411240274 42.9170624098898, 143.044290840306 42.9179844524745)) ^^http://www.opengis.net/ont/geosparql#wktLiteral