メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.709626318422 44.3679083188549, 141.708579117628 44.3685768148601, 141.70618677584 44.3666947148628, 141.706222095242 44.3666542056415, 141.706570064971 44.366277852849, 141.706974484183 44.3658012180428, 141.709626318422 44.3679083188549)) ^^http://www.opengis.net/ont/geosparql#wktLiteral