メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7312500 38.0416667, 140.7375000 38.0416667, 140.7375000 38.0458334, 140.7312500 38.0458334, 140.7312500 38.0416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral