メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3562500 33.4375000, 131.3625000 33.4375000, 131.3625000 33.4416667, 131.3562500 33.4416667, 131.3562500 33.4375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral