メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.358546914757 43.7708836033526, 142.358841258543 43.7714324744143, 142.357359702881 43.7718405591757, 142.3570650285 43.7713107449494, 142.35704263461 43.7713171831158, 142.356753677476 43.7707528171417, 142.358256931736 43.7703428885583, 142.358546914757 43.7708836033526)) ^^http://www.opengis.net/ont/geosparql#wktLiteral