メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6062500 34.4083333, 136.6125000 34.4083333, 136.6125000 34.4125000, 136.6062500 34.4125000, 136.6062500 34.4083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral