メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752175165065 43.1973729472767, 141.752819665836 43.1977089628322, 141.752213530363 43.1983830983941, 141.751551847184 43.1980375822543, 141.751298710049 43.1979114363429, 141.751268551213 43.1978963950213, 141.751911508626 43.1972282623893, 141.752175165065 43.1973729472767)) ^^http://www.opengis.net/ont/geosparql#wktLiteral