メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.8937500 39.2750000, 141.9000000 39.2750000, 141.9000000 39.2791667, 141.8937500 39.2791667, 141.8937500 39.2750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral