メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.369594821848 43.8226876702707, 142.368397676986 43.8235568758959, 142.36590488603 43.8221579549479, 142.366486002634 43.8216977691713, 142.366946601036 43.8213945721454, 142.367330274444 43.8211160106671, 142.368279884893 43.8217629362674, 142.369594821848 43.8226876702707)) ^^http://www.opengis.net/ont/geosparql#wktLiteral