メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.3911203757 44.1859665628677, 142.390172760084 44.1858090903475, 142.390530197642 44.1846819925065, 142.39147683024 44.1848343136242, 142.3911203757 44.1859665628677)) ^^http://www.opengis.net/ont/geosparql#wktLiteral