メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4125000 35.6416667, 140.4187500 35.6416667, 140.4187500 35.6458334, 140.4125000 35.6458334, 140.4125000 35.6416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral