メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.3875000 42.3708334, 142.3937500 42.3708334, 142.3937500 42.3750000, 142.3875000 42.3750000, 142.3875000 42.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral