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class Permission {
  String guid; // synthetic key makes create/add/update APIs easier
  String appId;
  String userId;
  String role; // "admin", "developer"
  String objectType; // "study" or "organization"
  String objectId; // "appId:studyId" or "appId:groupId"
  boolean transitive; // e.g. true if permission comes from org membership
}