public IEnumerable <ValidationFail> Validate(ProcessModel model) => model.Elements
.OfType <INamedProcessElement <IElement> >()
.Where(s => (
s.Element is Activity ||
s.Element is IEventCatcher
))
.Where(s => !model.GetOutcomingConnections(s.Name).Any())
.Select(s => new ValidationFail($"'{s.Name}' has no outgoing connections."));
