メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.331631617907 43.0992402246877, 141.331211060849 43.0987587519786, 141.331114774823 43.0986641595722, 141.330843243127 43.0983577362504, 141.331875680179 43.0979300716577, 141.332281074759 43.0977689010328, 141.332996848804 43.0985845476959, 141.331631617907 43.0992402246877)) ^^http://www.opengis.net/ont/geosparql#wktLiteral