メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2250000 39.3458334, 141.2312500 39.3458334, 141.2312500 39.3500000, 141.2250000 39.3500000, 141.2250000 39.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral