メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6062500 31.8583333, 130.6125000 31.8583333, 130.6125000 31.8625000, 130.6062500 31.8625000, 130.6062500 31.8583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral