メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1000000 39.6791667, 141.1062500 39.6791667, 141.1062500 39.6833333, 141.1000000 39.6833333, 141.1000000 39.6791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral