メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4437500 34.1708334, 131.4500000 34.1708334, 131.4500000 34.1750000, 131.4437500 34.1750000, 131.4437500 34.1708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral