getNodeSet not returning expected output

[GringoSk8]

\[code\]> library(XML)> tdoc <- xmlParse("http://gexf.net/data/dynamics_openintervals.gexf")> getNodeSet(tdoc,"/gexf/graph/nodes/node")list()attr(,"class")[1] "XMLNodeSet"\[/code\]I expect it to return a list of two objects, but it just returns an empty list. Here is the example GEXF file I'm working with: http://gexf.net/data/dynamics_openintervals.gexf