メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7812500 38.0000000, 140.7875000 38.0000000, 140.7875000 38.0041667, 140.7812500 38.0041667, 140.7812500 38.0000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral