メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5500000 32.1916667, 131.5562500 32.1916667, 131.5562500 32.1958334, 131.5500000 32.1958334, 131.5500000 32.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral