メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.3909375158 44.1764927300466, 142.390218987844 44.1763775683284, 142.390457731726 44.1755807639334, 142.39119099839 44.1756942716318, 142.3909375158 44.1764927300466)) ^^http://www.opengis.net/ont/geosparql#wktLiteral