メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3812500 35.8291667, 139.3875000 35.8291667, 139.3875000 35.8333333, 139.3812500 35.8333333, 139.3812500 35.8291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral