メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8812500 36.8666667, 136.8875000 36.8666667, 136.8875000 36.8708334, 136.8812500 36.8708334, 136.8812500 36.8666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral