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1. This Convention shall be subject to ratification, acceptance or approval by the signatory States and regional economic integration organizations referred to in Article 27.
2. This Convention shall be open for accession by the States and organizations referred to in Article 27.
3. Any organization referred to in Article 27 which becomes Party to this Convention without any of its member States being a Party shall be bound by all the obligations under this Convention. In the case of such organizations, one or more of whose member States is a Party to this Convention, the organization and its member States shall decide on their respective responsibilities for the performance of their obligations under this Convention. In such cases, the organization and the member States shall not be entitled to exercise rights under this Convention concurrently.
4. In their instruments of ratification, acceptance, approval or accession, the regional economic integration organizations referred to in Article 27 shall declare the extent of their competence with respect to the matters governed by this Convention. These organizations shall also inform the Depositary of any substantial modification to the extent of their competence.