メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1437500 35.9958334, 136.1500000 35.9958334, 136.1500000 36.0000000, 136.1437500 36.0000000, 136.1437500 35.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral