メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9562500 31.2875000, 130.9625000 31.2875000, 130.9625000 31.2916667, 130.9562500 31.2916667, 130.9562500 31.2875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral