メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403022607122 44.1748040554816, 142.40256803727 44.1745240092189, 142.402322331221 44.1744852412222, 142.402608340356 44.1734129385659, 142.403387628014 44.1735372205204, 142.403022607122 44.1748040554816)) ^^http://www.opengis.net/ont/geosparql#wktLiteral