メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7125000 39.2833333, 141.7187500 39.2833333, 141.7187500 39.2875000, 141.7125000 39.2875000, 141.7125000 39.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral