メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.2187500 43.1708334, 144.2250000 43.1708334, 144.2250000 43.1750000, 144.2187500 43.1750000, 144.2187500 43.1708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral