メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3875000 36.1250000, 139.3937500 36.1250000, 139.3937500 36.1291667, 139.3875000 36.1291667, 139.3875000 36.1250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral