メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2437500 35.8458334, 139.2500000 35.8458334, 139.2500000 35.8500000, 139.2437500 35.8500000, 139.2437500 35.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral