メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5812500 33.1958334, 130.5875000 33.1958334, 130.5875000 33.2000000, 130.5812500 33.2000000, 130.5812500 33.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral