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

class Scenario extends Block {
	
}

class Participant {
	attr String name;
}

abstract class Step {
	
}

class Block extends Step {
	attr String title;
	val Step[*] steps;
}

class Alt extends Step {
	attr String title;
	val Block[*] blocks;
}

class Interaction extends Step {
	ref Participant from;
	ref Participant to;
	attr String message;
}