メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.898745247289 43.0115990262071, 142.897487048846 43.0108269517123, 142.898432777144 43.0099783514244, 142.899716993809 43.0107649006991, 142.898745247289 43.0115990262071)) ^^http://www.opengis.net/ont/geosparql#wktLiteral