メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.374187961846 43.0511484932051, 141.373936458041 43.051314376142, 141.373401018415 43.0516674136537, 141.373059042459 43.0518627026217, 141.372033819639 43.0509987172676, 141.373189338833 43.0502816968145, 141.373707215636 43.0507175585348, 141.373727879669 43.0507345257078, 141.374187961846 43.0511484932051)) ^^http://www.opengis.net/ont/geosparql#wktLiteral