メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.004655152594 43.5636872766827, 145.004590383425 43.5636453819172, 145.003903922712 43.5631860173756, 145.00499689711 43.5623097542013, 145.005782100252 43.5628223170787, 145.004796640224 43.5635794769303, 145.004655152594 43.5636872766827)) ^^http://www.opengis.net/ont/geosparql#wktLiteral