メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2750000 35.3416667, 139.2812500 35.3416667, 139.2812500 35.3458334, 139.2750000 35.3458334, 139.2750000 35.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral