メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.9500000 43.6416667, 141.9562500 43.6416667, 141.9562500 43.6458334, 141.9500000 43.6458334, 141.9500000 43.6416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral