メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391004666041 44.1716247457948, 142.388469232492 44.1712213775563, 142.38835153379 44.1708666133506, 142.388082377176 44.1700553234404, 142.388574971137 44.1701340835932, 142.391331002285 44.1705747797015, 142.391004666041 44.1716247457948)) ^^http://www.opengis.net/ont/geosparql#wktLiteral