メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.8812500 39.3166667, 141.8875000 39.3166667, 141.8875000 39.3208334, 141.8812500 39.3208334, 141.8812500 39.3166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral