メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2750000 37.9541667, 139.2812500 37.9541667, 139.2812500 37.9583333, 139.2750000 37.9583333, 139.2750000 37.9541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral