メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.5000000 35.0458334, 138.5062500 35.0458334, 138.5062500 35.0500000, 138.5000000 35.0500000, 138.5000000 35.0458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral