I have some problem, save to XML GoNode nested to SubGraph. Thank You!
If you are using GoXml, you may find useful the XmlSubGraphTextNode example code in the Demo1 sample.
Of course, if your nodes are not GoTextNodes or GoLabeledLinks, you will need to adapt the code to suit your application.
And in any case you will want to customize the properties/attributes being saved for both the nodes (including GoSubGraph nodes) and for the links.