メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8812500 35.5833333, 136.8875000 35.5833333, 136.8875000 35.5875000, 136.8812500 35.5875000, 136.8812500 35.5833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral