メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.698822379744 44.3654884603653, 141.69830885853 44.3658284421776, 141.698274534126 44.3658511636288, 141.698037562691 44.3656646292458, 141.697267535534 44.3650649427275, 141.697194878456 44.3650052800386, 141.697215787738 44.3649915642847, 141.697469008741 44.3648253030595, 141.697785009559 44.364622536223, 141.697893165144 44.3647065939934, 141.698855767214 44.3654663318181, 141.698822379744 44.3654884603653)) ^^http://www.opengis.net/ont/geosparql#wktLiteral