メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.8312500 39.9250000, 139.8375000 39.9250000, 139.8375000 39.9291667, 139.8312500 39.9291667, 139.8312500 39.9250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral