メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.983098220744 43.5497959540743, 144.982605674425 43.5502050736513, 144.981831785764 43.5496181055056, 144.982273550712 43.5492704326181, 144.983098220744 43.5497959540743)) ^^http://www.opengis.net/ont/geosparql#wktLiteral