メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.377665340991 43.7640545525759, 142.377963052343 43.7646154594766, 142.376475423549 43.7650494019462, 142.376167925286 43.7644889045763, 142.375849660022 43.763916746408, 142.376545465983 43.7636913436733, 142.377342756165 43.7634645581571, 142.377665340991 43.7640545525759)) ^^http://www.opengis.net/ont/geosparql#wktLiteral