メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.269680921571 44.0198921187169, 144.268072720539 44.0197371431813, 144.268188559716 44.0191481448584, 144.269777425567 44.019313788689, 144.269680921571 44.0198921187169)) ^^http://www.opengis.net/ont/geosparql#wktLiteral