メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2250000 39.6166667, 140.2312500 39.6166667, 140.2312500 39.6208334, 140.2250000 39.6208334, 140.2250000 39.6166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral