メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.291257274896 43.1131928953184, 141.290160657899 43.1139906625444, 141.290171914079 43.1125638546409, 141.290166025837 43.1119823958936, 141.290212320725 43.1099836190225, 141.291405609428 43.1110446755171, 141.292654908418 43.1121848891429, 141.291257274896 43.1131928953184)) ^^http://www.opengis.net/ont/geosparql#wktLiteral