@namespace(uri="flowchart", prefix="f")
package flowchart;

abstract class NamedElement {
	attr String name;
}

class Flowchart extends NamedElement {
	val Node[*] nodes;
	val Transition[*] transitions;
}

abstract class Node extends NamedElement {
	ref Transition[*]#source outgoing;
	ref Transition[*]#target incoming;
}

class Transition extends NamedElement {
	ref Node#outgoing source;
	ref Node#incoming target;
}

class Action extends Node {
}

class Decision extends Node {
}

class Subflow extends Flowchart, Node {
}