メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7562500 40.3166667, 140.7625000 40.3166667, 140.7625000 40.3208334, 140.7562500 40.3208334, 140.7562500 40.3166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral