The third part mainly discusses important document of Tang Dynasty marriage law system and its legal effect.

第三部分分析了唐代婚姻成立的要件及其法律效力。

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Its legal effect is particular: once adopted, it comes into effect prior to the international and domestic law.

其法律效力具有特殊性，一旦采用，即具有优先于公约和国内法的效力。

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The fourth part elaborates the relieving way of Tang Dynasty marriage law system from nature and artificial, and points out its legal effect.

第四部分从自然和人为两方面论述了唐代婚姻的解除方式，并指出其法律效力。

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That appointment was also invalid, and so the Bureau has no power to enforce any of its regulatory requirements, and all of the regulations it has issued are of no legal force or effect.

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