メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399652460453 44.1808817429477, 142.398857834572 44.1807450118341, 142.399228207163 44.1795754000143, 142.400013993581 44.1796955812639, 142.399652460453 44.1808817429477)) ^^http://www.opengis.net/ont/geosparql#wktLiteral