メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5687500 30.4125000, 130.5750000 30.4125000, 130.5750000 30.4166667, 130.5687500 30.4166667, 130.5687500 30.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral