メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908514013588 43.4992221710425, 141.90774270631 43.499331193141, 141.907440566457 43.4982266586044, 141.907404656702 43.4981624135272, 141.908195720635 43.4980421647421, 141.908540963369 43.4992183482707, 141.908514013588 43.4992221710425)) ^^http://www.opengis.net/ont/geosparql#wktLiteral