RDF graph representation

This may be a bit of sophistry, but since predicate may be used as
subject (and object, I assume) in RDF, doesn't this make a
node-arc-node representation of a triple invalid?

For instance, how would you represent an OWL property restriction in
such a graph mode? Wouldn't this mean that you'd have to point an arc
into the middle of another arc?

Or am I missing something here? (which is probably the case) 

Illuminate me please..