メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.1062500 42.6208334, 143.1125000 42.6208334, 143.1125000 42.6250000, 143.1062500 42.6250000, 143.1062500 42.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral