メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39147683024 44.1848343136242, 142.390530197642 44.1846819925065, 142.390947594834 44.1833563697682, 142.39147243344 44.1834433046502, 142.3919062424 44.1835151585914, 142.39147683024 44.1848343136242)) ^^http://www.opengis.net/ont/geosparql#wktLiteral