メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6062500 43.3625000, 144.6125000 43.3625000, 144.6125000 43.3666667, 144.6062500 43.3666667, 144.6062500 43.3625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral