Dreessen TITJUR Opinion of Mr Advocate General Léger delivered on 17 May 2001. # Conseil national de l'ordre des architectes v Nicolas Dreessen. # Reference for a preliminary ruling: Cour de cassation - Belgium. # Reference for a preliminary ruling - Articles 10 EC and 43 EC - National legislation restricting access to the profession of architect to the possession of a diploma or professional qualification - Community national holding a diploma not listed in Directive 85/384/EEC - Obligation on the host Member State when presented with an application to practise the profession of architect on its territory to make a comparison between the specialised knowledge and abilities certified by the diploma and the experience acquired, and the qualifications required by its national legislation. # Case C-31/00.