メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395700642844 44.1703587652582, 142.394158427502 44.1701218073369, 142.394401523864 44.1693583556873, 142.395955368107 44.1695998121962, 142.395700642844 44.1703587652582)) ^^http://www.opengis.net/ont/geosparql#wktLiteral