メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2000000 34.9750000, 137.2062500 34.9750000, 137.2062500 34.9791667, 137.2000000 34.9791667, 137.2000000 34.9750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral