Part Three. Court Proceedings
Section IX. Proceedings in a Court of the First Instance
Chapter 37. Judicial Investigation
Article 278. Interrogation of Witnesses
3. The first to put questions to the witness shall be the party, on whose petition he was summoned to the court session. The judge shall put questions to the witness after the latter has been interrogated by the parties .
Fair trial standards
Rights during trial - examine witnesses
EDIT.