メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.8000000 34.8625000, 137.8062500 34.8625000, 137.8062500 34.8666667, 137.8000000 34.8666667, 137.8000000 34.8625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral