メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1812500 39.7375000, 140.1875000 39.7375000, 140.1875000 39.7416667, 140.1812500 39.7416667, 140.1812500 39.7375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral