メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.5062500 34.7500000, 137.5125000 34.7500000, 137.5125000 34.7541667, 137.5062500 34.7541667, 137.5062500 34.7500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral