メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398857834572 44.1807450118341, 142.398071721878 44.1806171242105, 142.398233061112 44.1800959946919, 142.39845682294 44.1794507646158, 142.399228207163 44.1795754000143, 142.398857834572 44.1807450118341)) ^^http://www.opengis.net/ont/geosparql#wktLiteral