Principle of investigation

(1) The appellate court investigates the facts of its own motion.
(2) The court must work towards ensuring that formal defects are remedied, unclear applications are clarified, appropriate applications are made, insufficient factual particulars are supplemented, and, further, that all declarations material to establishing and assessing the facts are made.
(3) The appellate court may require the parties, within a period to be determined, to comment on points requiring clarification, to designate evidence, and to produce documents and other evidence in their possession. Where the period is missed, a decision may be made, according to the state of the matter, disregarding the evidence not produced.