メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0687500 36.0500000, 139.0750000 36.0500000, 139.0750000 36.0541667, 139.0687500 36.0541667, 139.0687500 36.0500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral