Hence, if a State were to determine that distinguishing between documented and undocumented aliens is necessary to protect public safety, such a distinction would not be forbidden by the Declaration.
因此，如果一国决定为保护公共安全而有必要在有证件和无证件的外侨之间作出区别对待，那么该《宣言》并不禁止作出这种区别。