メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912415975677 43.4975870432054, 141.910891144865 43.4978175907091, 141.910848818432 43.4976783946007, 141.910810057397 43.4975321057569, 141.910703812521 43.4972153917183, 141.912242662784 43.4969672002679, 141.912415975677 43.4975870432054)) ^^http://www.opengis.net/ont/geosparql#wktLiteral