PART III. – BASIC PRINCIPLES OF GOVERNMENT.
Division 3. – Basic Rights.
Subdivision B. – Fundamental Rights.
37. PROTECTION OF THE LAW.
(15) Every person convicted of an offence is entitled to have his conviction and sentence reviewed by a higher court or tribunal according to law.
(16) No person shall be deprived by law of a right of appeal against his conviction or sentence by any court that existed at the time of the conviction or sentence, as the case may be.
Appeal against decision of acquittal or conviction or against sentence - national proceedings
EDIT.