メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7500000 38.7416667, 140.7562500 38.7416667, 140.7562500 38.7458334, 140.7500000 38.7458334, 140.7500000 38.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral