2 circumstances (rebus sic stantibus)) are not given to remove the principle of estoppel; or that it is impossible to request a clarification or interpretation of the same, both by analogy, as indicated in the principal vote, and by the general principles mentioned, as confirmed by the very Judgment of July 21, 1989, inasmuch as it decided to keep the case open until it is fully complied with. However, that possibility is not the one contemplated in Article 67 of the Convention and, consequently, is not subject either to a petition by the parties, nor to time limits, but is maintained open for as long as necessary during the course of enforcing the definite judgment. Rodolfo E. Piza E. Manuel E. Ventura-Robles Secretary