メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.829544368377 43.0730472722792, 142.828798251174 43.0728860565652, 142.828725289754 43.0728703207623, 142.828101597076 43.0727354867666, 142.828047235315 43.0727237354304, 142.827753417187 43.0726603057495, 142.82758494368 43.0726231779959, 142.826366075598 43.0723546880647, 142.826966751573 43.0707474206361, 142.830192057291 43.0714541684649, 142.829544368377 43.0730472722792)) ^^http://www.opengis.net/ont/geosparql#wktLiteral