メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.381447470417 43.7518087540686, 142.380554529962 43.7520722445633, 142.380378244819 43.751067322316, 142.38118835437 43.7508269040561, 142.381422883943 43.7512499891316, 142.381663409604 43.7517407689413, 142.381447470417 43.7518087540686)) ^^http://www.opengis.net/ont/geosparql#wktLiteral