メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398486944872 44.1819573771372, 142.398463434801 44.1819538200317, 142.397693850428 44.1818375462152, 142.398071721878 44.1806171242105, 142.398857834572 44.1807450118341, 142.398486944872 44.1819573771372)) ^^http://www.opengis.net/ont/geosparql#wktLiteral