メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5937500 37.5250000, 139.6000000 37.5250000, 139.6000000 37.5291667, 139.5937500 37.5291667, 139.5937500 37.5250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral