メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.370560603704 43.1058056489211, 141.370501216758 43.1060313598997, 141.370447204607 43.1062369285728, 141.369604354588 43.106117515095, 141.368770055009 43.1059911974181, 141.368820687805 43.1057739301133, 141.368828974947 43.105738338242, 141.368870062137 43.1055708577326, 141.370560603704 43.1058056489211)) ^^http://www.opengis.net/ont/geosparql#wktLiteral