メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6250000 43.3166667, 144.6312500 43.3166667, 144.6312500 43.3208334, 144.6250000 43.3208334, 144.6250000 43.3166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral