メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8000000 38.0041667, 140.8062500 38.0041667, 140.8062500 38.0083333, 140.8000000 38.0083333, 140.8000000 38.0041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral