メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.363660945573 43.7706555294182, 142.363955868656 43.7711930542912, 142.363411761516 43.771349281324, 142.362515083498 43.7715962817092, 142.362223580971 43.7710715142689, 142.361919460396 43.7705238509606, 142.363358541747 43.7701044045717, 142.363660945573 43.7706555294182)) ^^http://www.opengis.net/ont/geosparql#wktLiteral