メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2437500 33.5958334, 131.2500000 33.5958334, 131.2500000 33.6000000, 131.2437500 33.6000000, 131.2437500 33.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral