▁ ▁Tow ards ▁this ▁objective ▁the ▁adaptation ▁of ▁Digital ▁Items ▁is ▁required . ▁As ▁shown ▁in ▁the ▁next ▁concept ual ▁schema , ▁a ▁Digital ▁Item ▁is ▁subject ▁to ▁a ▁des criptor ▁adaptation ▁engine , ▁as ▁well ▁as ▁a ▁resource ▁adaptation ▁engine , ▁which ▁produce ▁together ▁the ▁adapted ▁Digital ▁Item . ▁ ▁File ▁Format ▁ ▁At ▁this ▁point , ▁we ▁know ▁that ▁a ▁Digital ▁Item ▁can ▁be ▁a ▁complex ▁collection ▁of ▁information . ▁Both ▁still ▁and ▁dynamic ▁media ▁can ▁be ▁included , ▁for ▁example : ▁images ▁and ▁mov ies ; ▁as ▁well ▁as ▁Digital ▁Item ▁information , ▁metadata , ▁layout ▁information , ▁and ▁so ▁on . ▁It ▁can ▁also ▁include ▁both ▁text ual ▁data , ▁XML ▁for ▁instance , ▁and ▁binary ▁data , ▁like ▁an ▁M PE G - 4 ▁presentation ▁or ▁a ▁still ▁picture . ▁▁ ▁The ▁M PE G - 2 1 ▁Part ▁ 9 ▁specification ▁( ISO / IE C ▁ 2 1 0 0 0 - 9 ) ▁defined ▁the ▁M PE G - 2 1 ▁File ▁Format . ▁It ▁is ▁based ▁on ▁the ▁ISO ▁base ▁media ▁file ▁format ▁and ▁designed ▁to ▁contain ▁a ▁base ▁M PE G - 2 1 ▁XML ▁document ▁with ▁some ▁or ▁all ▁of ▁its ▁anc ill ary ▁resources , ▁potentially ▁in ▁a ▁single ▁package . ▁It ▁uses ▁filename ▁extension ▁. m 2 1 ▁or ▁. mp 2 1 ▁and ▁M IME ▁type ▁application / mp 2 1 . ▁ ▁References ▁ ▁Category : MP EG <0x0A> </s> ▁F ang bone ! ▁is ▁a ▁Canadian ▁animated