メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5562500 43.2541667, 144.5625000 43.2541667, 144.5625000 43.2583333, 144.5562500 43.2583333, 144.5562500 43.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral