メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.373059042459 43.0518627026217, 141.372056510106 43.0524882003362, 141.37157300115 43.0520630736988, 141.371051169795 43.0516022037943, 141.371327836176 43.0514291778226, 141.371681285294 43.0512081285069, 141.372033819639 43.0509987172676, 141.373059042459 43.0518627026217)) ^^http://www.opengis.net/ont/geosparql#wktLiteral