メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.401467445722 44.1780098052864, 142.399796577392 44.1777625194536, 142.40000245986 44.1770837155072, 142.4008285113 44.177220434432, 142.401676403786 44.1773518080767, 142.401467445722 44.1780098052864)) ^^http://www.opengis.net/ont/geosparql#wktLiteral