メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.5125000 38.7541667, 141.5187500 38.7541667, 141.5187500 38.7583333, 141.5125000 38.7583333, 141.5125000 38.7541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral