String oldExternalType = myExternalType;
String oldExternalType = getExternalType();
  public void setExternalType(String _externalType) {    String oldExternalType = myExternalType;    myExternalType = (String) _nullIfPrototyped(EOAttribute.EXTERNAL_TYPE, _externalType);    firePropertyChange(EOAttribute.EXTERNAL_TYPE, oldExternalType, getExternalType());  }