メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.501776978202 32.0717626531458, 131.501956966688 32.0719628910048, 131.501797698236 32.072073716501, 131.501602490656 32.0718670567377, 131.501776978202 32.0717626531458)) ^^http://www.opengis.net/ont/geosparql#wktLiteral