メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.89338730205 43.0134480011636, 142.892265645956 43.0127490224199, 142.891109478977 43.0120284246038, 142.891221766627 43.0120066984092, 142.892769760344 43.0117075707273, 142.893217346123 43.0129355479453, 142.89338730205 43.0134480011636)) ^^http://www.opengis.net/ont/geosparql#wktLiteral