Article 4
1. Member States shall bring into force the necessary laws, regulations and administrative provisions to comply with this Directive by 18 December 2011 at the latest. They shall forthwith communicate to the Commission the text of those provisions and a correlation table between the provisions and this Directive. When Member States adopt those provisions, they shall contain a reference to this Directive or be accompanied by such a reference on the occasion of their official publication. Member States shall determine how such reference is to be made. 2. Member States shall communicate to the Commission the text of the provisions of national law which they adopt in the field covered by this Directive.