メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9437500 31.3666667, 130.9500000 31.3666667, 130.9500000 31.3708334, 130.9437500 31.3708334, 130.9437500 31.3666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral