(43)To the extent that they are regulated, this Directive includes also liberal professions, which are, according to this Directive, those practised on the basis of relevant professional qualifications in a personal, responsible and professionally independent capacity by those providing intellectual and conceptual services in the interest of the client and the public. The exercise of the profession might be subject in the Member States, in conformity with the Treaty, to specific legal constraints based on national legislation and on the statutory provisions laid down autonomously, within that framework, by the respective professional representative bodies, safeguarding and developing their professionalism and quality of service and the confidentiality of relations with the client.