メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0375000 34.9500000, 137.0437500 34.9500000, 137.0437500 34.9541667, 137.0375000 34.9541667, 137.0375000 34.9500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral