メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0625000 34.8666667, 139.0687500 34.8666667, 139.0687500 34.8708334, 139.0625000 34.8708334, 139.0625000 34.8666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral