Translate the following English sentence to French:
"The key principles of this proposed directive are as follows: restriction of the geographical area covered by conventional system interoperability to the trans-European network as defined by the 1996 European Parliament and Council Decision; a policy of gradual convergence rather than systematic renewal, taking the form of phasing in priorities and interoperability, establishing a hierarchy for subsystems to enable the fastest and cheapest access, with priority only to new investment for creating, extending, renewing, maintaining and operating systems; establishing a hierarchy of objectives, distinguishing across-the-board objectives to be included in all standards: safety, reliability, health, environmental protection and technical compatibility; the objectives inherent in each technical subsystem: infrastructure, energy, rolling stock, etc.; the separation of the technical task of framing the TSIs assigned to a joint representative body, from the standardisation work entrusted to the European standards institutes, and the inspection and certification entrusted to notified bodies; a policy of user consultation, as suggested by the Committee on Regional Policy, Transport and Tourism which cannot be envisaged, ladies and gentlemen, without concomitant consultation of staff representatives, the subject of an amendment that we shall be discussing tomorrow; finally, ongoing monitoring of these projects by the Member States and the Commission through the Committee established under Article 21, implemented by the high-speed directive, enabling states to request exemptions, to include special cases in the technical specifications for purely historic or regional networks, as well as certain types of equipment originating from third countries, and also instruments for authorising commissioning operations notified by Member States to the Commission."
Une hiérarchisation des objectifs qui distingue des objectifs transversaux qui doivent s'imposer à toutes les normes : sécurité, fiabilité, santé, protection de l'environnement, compatibilité technique ; des objectifs inhérents à chaque sous-système technique : infrastructures, énergie, matériel roulant, etc. ; une séparation du travail technique d'élaboration des STI qui est confiée à un organisme commun représentatif, de la normalisation qui est confiée aux organismes de normalisation européens, du contrôle et de la certification confiés à des organismes notifiés. Une logique de concertation avec les usagers proposée par la commission des transports que l'on n'imagine pas, mes chers collègues, sans une concertation parallèle des représentants du personnel, objet d'un amendement que nous aurons à délibérer demain.