メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.0375000 35.4375000, 136.0437500 35.4375000, 136.0437500 35.4416667, 136.0375000 35.4416667, 136.0375000 35.4375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral