Case C-306/09: Judgment of the Court (Fourth Chamber) of 21 October 2010 (reference for a preliminary ruling from the Cour constitutionnelle (Belgium)) — Execution of a European arrest warrant issued in respect of I.B. (Police and judicial cooperation in criminal matters — Framework Decision 2002/584/JHA — European arrest warrant and the surrender procedures between Member States — Article 4 — Grounds for optional non-execution — Article 4(6) — Arrest warrant issued for the purposes of execution of a sentence — Article 5 — Guarantees to be provided by the issuing Member State — Article 5(1) — Sentence imposed in absentia — Article 5(3) — Arrest warrant issued for the purposes of criminal prosecution — Surrender subject to the condition that the requested person be returned to the Member State of execution — Joint application of Article 5(1) and Article 5(3) — Compatibility)