メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.324669984892 43.0441314325426, 141.324373667371 43.0445600851215, 141.324192100581 43.0448182721154, 141.323572011656 43.0444984592532, 141.322976498927 43.0441899536309, 141.322065434151 43.0437216290311, 141.322358031212 43.0434130033346, 141.323080315722 43.0426565526598, 141.323656582329 43.0429372634531, 141.324028953767 43.0431126550145, 141.325040809398 43.0436124433362, 141.324851089752 43.0438778807725, 141.324669984892 43.0441314325426)) ^^http://www.opengis.net/ont/geosparql#wktLiteral