メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.900419539739 34.7341926745469, 137.89926858808 34.7337991940422, 137.898214146505 34.7334336489081, 137.898663999452 34.7325348285753, 137.900872460122 34.7332734366652, 137.900505155666 34.7340151970991, 137.900419539739 34.7341926745469)) ^^http://www.opengis.net/ont/geosparql#wktLiteral