メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9000000 31.3541667, 130.9062500 31.3541667, 130.9062500 31.3583333, 130.9000000 31.3583333, 130.9000000 31.3541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral