Returns a string with a space separated list of the selected nodes in the given network, including selected children according to the context.
flag = 0: Do not keep the context. Every selected node will be returned.
flag = 1: Keep the context. It will return only selected nodes belonging to the same context as the “network” argument.
Returns “edgecusp1 subnet1 subnet1/sphere2”
Returns “edgecusp1 shopnet1 subnet1 subnet1/sphere2”.