メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.2187500 30.4541667, 130.2250000 30.4541667, 130.2250000 30.4583333, 130.2187500 30.4583333, 130.2187500 30.4541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral