メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5000000 34.4666667, 135.5062500 34.4666667, 135.5062500 34.4708334, 135.5000000 34.4708334, 135.5000000 34.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral