メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.5062500 38.7583333, 141.5125000 38.7583333, 141.5125000 38.7625000, 141.5062500 38.7625000, 141.5062500 38.7583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral