メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6625000 40.6291667, 140.6687500 40.6291667, 140.6687500 40.6333333, 140.6625000 40.6333333, 140.6625000 40.6291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral