メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4500000 39.1000000, 140.4562500 39.1000000, 140.4562500 39.1041667, 140.4500000 39.1041667, 140.4500000 39.1000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral