title: Rgexf dynamic node attributes
body: <p>I'm trying to build a dynamic gexf graph-file using the R library Rgexf. It is great so far but I would like to add node attributes changing over time. As I understand it the gexf format supports this but I don't know how to add this using the R library.</p>
  
  <p>Is this possible with rgexf?
  If not which would be another way to do it? 
  I have some basic python knowlegde would pygexf a mor powerfull alternative?</p>