メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3000000 38.2791667, 140.3062500 38.2791667, 140.3062500 38.2833333, 140.3000000 38.2833333, 140.3000000 38.2791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral