メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395444372799 44.171236236903, 142.393898318621 44.1709806637931, 142.394158427502 44.1701218073369, 142.395700642844 44.1703587652582, 142.395444372799 44.171236236903)) ^^http://www.opengis.net/ont/geosparql#wktLiteral