メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2250000 39.4666667, 141.2312500 39.4666667, 141.2312500 39.4708334, 141.2250000 39.4708334, 141.2250000 39.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral