examples/org.eclipse.epsilon.examples.metamodels/Graph.emf

@namespace(uri="Graph", prefix="Graph")
package Graph;

class Graph {
   val Node[*] nodes;
}

class Node {
   attr String name;
   val Edge[*]#source outgoing;
   ref Edge[*]#target incoming;
}

class Edge {
   ref Node#outgoing source;
   ref Node#incoming target;
}