メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.287420307742 43.1562553999056, 141.288023147414 43.1566987566517, 141.288636158111 43.1571495801746, 141.289266650563 43.157613347333, 141.287553882748 43.1587854584749, 141.286972609812 43.158356275212, 141.28635820289 43.1579026179769, 141.285764981096 43.1574646087994, 141.285153727287 43.1570132224194, 141.285571355799 43.1567172154212, 141.286832670863 43.1558231388594, 141.287420307742 43.1562553999056)) ^^http://www.opengis.net/ont/geosparql#wktLiteral