メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7500000 42.6208334, 140.7562500 42.6208334, 140.7562500 42.6250000, 140.7500000 42.6250000, 140.7500000 42.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral