メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.34978033088 44.4827993498714, 142.34890355188 44.4825787713772, 142.349281844258 44.4818284514565, 142.350211957169 44.4820213821237, 142.34978033088 44.4827993498714)) ^^http://www.opengis.net/ont/geosparql#wktLiteral