メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5687500 35.2541667, 136.5750000 35.2541667, 136.5750000 35.2583333, 136.5687500 35.2583333, 136.5687500 35.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral