メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.1500000 45.2000000, 142.1562500 45.2000000, 142.1562500 45.2041667, 142.1500000 45.2041667, 142.1500000 45.2000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral