メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397511227771 44.1690601840052, 142.39750801754 44.1690705423395, 142.396205596881 44.1688622935659, 142.396641650054 44.1674248242993, 142.396990231314 44.1674805621514, 142.39699259102 44.1674720859729, 142.3979565509 44.167625211895, 142.397511227771 44.1690601840052)) ^^http://www.opengis.net/ont/geosparql#wktLiteral