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//Option #B1 (currently in proposal): Have one single node type with all required attributes

interface Node {

        String getName();

        boolean isInIterable();

        Integer getIndex();

        Object getKey();

        MethodDescriptor getMethodDescriptor();

        ConstructorDescriptor getConstructorDescriptor();

        ParameterDescriptor getParameterDescriptor();

        //currently not in the proposal, but it seems actually more regular to me
        //than representing return value constraints on the method descriptor
        ReturnValueDescriptor getReturnValueDescriptor();
}

//Iterating over a Path

Path path = ...;
Iterator<Node> nodeIterator = path.iterator();
while(nodeIterator.hasNext()) {
        Node node = nodeIterator.next();

        if(node.getMethodDescriptor() != null) {
                //...
        }
        else if(node.getConstructorDescriptor() != null) {
                //...
        }
}