メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.5062500 38.8125000, 141.5125000 38.8125000, 141.5125000 38.8166667, 141.5062500 38.8166667, 141.5062500 38.8125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral