メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2000000 37.7208334, 139.2062500 37.7208334, 139.2062500 37.7250000, 139.2000000 37.7250000, 139.2000000 37.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral