メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4437500 36.4125000, 140.4500000 36.4125000, 140.4500000 36.4166667, 140.4437500 36.4166667, 140.4437500 36.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral