メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7812500 35.0666667, 136.7875000 35.0666667, 136.7875000 35.0708334, 136.7812500 35.0708334, 136.7812500 35.0666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral