メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.356112598905 43.1536489892585, 141.356361281086 43.1547385708431, 141.35581734849 43.1548006400503, 141.354652704188 43.1549660145322, 141.354393609569 43.1550595627982, 141.353573029533 43.1551800062886, 141.353460492422 43.1547164324479, 141.353370817209 43.1543647192744, 141.353276011712 43.1540092381763, 141.353196938114 43.1535895310068, 141.354628604127 43.153404385923, 141.355473148903 43.1533119686155, 141.356023191549 43.1532318015238, 141.356112598905 43.1536489892585)) ^^http://www.opengis.net/ont/geosparql#wktLiteral