Provincial and municipal institutions are regulated by the law.
The law guarantees the application of the following principles:
1° the direct election of the members of provincial and municipal coun-cils;
2° the attribution to provincial and municipal councils of all that is of provincial and municipal interest, without prejudice to the approval of their acts in the cases and in the manner that the law determines;
3° the decentralisation of competences to provincial and municipal in-stitutions;
4° the public nature of provincial and municipal council meetings, within the limits established by the law;
5° the disclosure of accounts and budgets;
6° the intervention of the supervisory authority or of the federal legisla-tive power to prevent the law from being violated or public interests from being harmed.
Supra-municipal collectivities are governed by the rule referred to in Arti-cle 134. This rule enshrines the application of the principles mentioned in the second paragraph. Other principles considered essential can be set by the rule referred to in Article 134, whether or not adopted by a majority of two thirds of the votes cast, under the condition that the majority of the members of the Parliament concerned is present. Articles 159 and 190 are applicable to decisions and regulations of supra-municipal collectivities.”
In accordance with a law adopted by a majority as described in Article 4, last paragraph, the federate law or the rule referred to in Article 134 estab-lishes the conditions and the manner in which several provinces, supra-mu-nicipal collectivities or municipalities can cooperate or form associations. However, provincial councils, councils of supra-municipal collectivities or municipal councils cannot be permitted to deliberate jointly.