メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4625000 38.7458334, 140.4687500 38.7458334, 140.4687500 38.7500000, 140.4625000 38.7500000, 140.4625000 38.7458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral