メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3937500 34.6833333, 139.4000000 34.6833333, 139.4000000 34.6875000, 139.3937500 34.6875000, 139.3937500 34.6833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral