メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3500000 32.0916667, 131.3562500 32.0916667, 131.3562500 32.0958334, 131.3500000 32.0958334, 131.3500000 32.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral