code: func NewZone(name, file string) *Zone {
  	z := &Zone{
  		origin:         dns.Fqdn(name),
  		origLen:        dns.CountLabel(dns.Fqdn(name)),
  		file:           path.Clean(file),
  		Tree:           &tree.Tree{},
  		Expired:        new(bool),
  		ReloadShutdown: make(chan bool),
  	}
  	*z.Expired = false
  
  	return z
  }
docs: // NewZone returns a new zone.