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

@gmf.diagram
class Model extends NamedElement {
  val Group[*] groups;
}

class NamedElement {
  attr String name;
}

@gmf.node(label="name", phantom="true")
class Group extends NamedElement {

  @gmf.link(label="member")
  val Member[*] members;

  @gmf.link(label="subgroup")
  val Group[*] subGroups;
}

@gmf.node(label="name", phantom="true")
class Member extends NamedElement {
}