メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.0062500 44.0625000, 145.0125000 44.0625000, 145.0125000 44.0666667, 145.0062500 44.0666667, 145.0062500 44.0625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral