メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.9437500 42.1500000, 142.9500000 42.1500000, 142.9500000 42.1541667, 142.9437500 42.1541667, 142.9437500 42.1500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral