Art. 56. The provisions of article 50 shall apply to express extra-procedural pardon .
https://www.youtube.com/embed/kLdz_xMubUo?feature=oembed
This video is repeated in articles 41, 44, 45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, as it deals with all of them. Subjects: complaint, elements, power of attorney, indivisibility, waiver and pardon.
express extra-procedural pardon
Comments: The express extra-procedural pardon will consist of a declaration signed by the offended party, by his/her legal representative or by an attorney-in-fact with special powers. Procedural pardon is referred to in Article 58.