Elements for Reflections on Professional Ethics

What are the interests and the eventual stakes for professional deontology in the heart of the library, a place representative of intellectual liberty ? To respond to this question, reflection can be orientated towards access to collections, on the principles that guide their constitution pluralism, selection and proscription but also towards protection of the reader as much as the librarian. In this last case, mustn't we reflect on the introduction of a conscience clause with the perspective of an eventual code of ethics ?