メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906162080029 43.4851664712813, 141.905347626603 43.4852898445882, 141.905322130218 43.4852937414655, 141.905197105822 43.484948142408, 141.904953169071 43.4841135708104, 141.905811560805 43.4839718373597, 141.906162080029 43.4851664712813)) ^^http://www.opengis.net/ont/geosparql#wktLiteral