メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0937500 35.6416667, 139.1000000 35.6416667, 139.1000000 35.6458334, 139.0937500 35.6458334, 139.0937500 35.6416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral