メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1625000 43.8875000, 144.1687500 43.8875000, 144.1687500 43.8916667, 144.1625000 43.8916667, 144.1625000 43.8875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral