9 willingness (animus) to give concrete expression to the scope of those legislative obligations in the framework of the determination of the distinct measures of reparation for violations of the protected human rights. Antônio Augusto Cançado Trindade Judge Manuel E. Ventura Robles Secretary pronounced clearly on the matter: in the aforementioned Judgment, it stated that national laws were "acts that express the will of States and constitute their activities, just as judicial decisions and administrative measures do", and concluded that the Polish legislation in question was contrary to the German-Polish Convention which protected the German interests at stake; and in the aforementioned Advisory Opinion, it maintained that the Polish legislative measures at issue were not in conformity with Poland's international obligations. Cit. in U.N., Yearbook of the International Law Commission (1964) vol. II, p. 138. However, to resort to classic international case-law on the matter does not appear strictly necessary to me: given the specificity of the International Law of Human Rights, the pronouncements, on the subject, on the part of the international human rights supervisory organs, are, in my view, more than sufficient to affirm the existence of legislative obligations of the States Parties to the treaties of protection. - The incompatibility or otherwise of a law with human rights treaties such as the American Convention ought to be demonstrated in the particular circumstances of a concrete case. Once affirmed the existence of such legislative obligations of States Parties, the next step to be taken would consist of giving precision to its scope, so as to render effective the protected rights.