メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.312533894738 43.1042366159187, 141.312163753742 43.1044401359412, 141.311475612871 43.1037648315498, 141.310806909766 43.1030872900702, 141.312450005339 43.1021743348226, 141.313118244358 43.1028451115449, 141.313657678085 43.1033846519648, 141.313806139147 43.1035370718818, 141.313435328026 43.1037410124195, 141.313006343756 43.1039768258859, 141.312533894738 43.1042366159187)) ^^http://www.opengis.net/ont/geosparql#wktLiteral