メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6000000 35.8500000, 140.6062500 35.8500000, 140.6062500 35.8541667, 140.6000000 35.8541667, 140.6000000 35.8500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral