メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.371292750964 43.0058608717561, 144.371585145345 43.0064100552164, 144.370125954067 43.0068495305261, 144.36984123885 43.0062947862177, 144.36952917036 43.0057413937182, 144.37096823783 43.0053025785966, 144.371292750964 43.0058608717561)) ^^http://www.opengis.net/ont/geosparql#wktLiteral