メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.393217360791 44.1730451153986, 142.392433911265 44.1729282030224, 142.392748230148 44.1719054081434, 142.39356337502 44.1720296809486, 142.393217360791 44.1730451153986)) ^^http://www.opengis.net/ont/geosparql#wktLiteral