▁any ▁special ▁needs ▁identified ▁by ▁the ▁J - 6 ▁for ▁the ▁I & S ▁cert ification ▁process . ▁ ▁Represent ation ▁Represent ations ▁for ▁the ▁Do D AF ▁products ▁may ▁be ▁drawn ▁from ▁many ▁diagram ming ▁techniques ▁including : ▁ ▁tables ▁ ▁IDE F ▁ ▁Entity - rel ations hip ▁diag rams ▁( ER D s ) ▁ ▁U ML ▁ ▁S ys ML ▁There ▁is ▁a ▁UP DM ▁( Un ified ▁Profile ▁for ▁Do D AF ▁and ▁M OD AF ) ▁effort ▁within ▁the ▁O M G ▁to ▁standard ize ▁the ▁representation ▁of ▁Do D AF ▁products ▁when ▁U ML ▁is ▁used . ▁ ▁Do D AF ▁gener ically ▁describes ▁in ▁the ▁representation ▁of ▁the ▁artifact s ▁to ▁be ▁generated , ▁but ▁allows ▁considerable ▁flex ibility ▁regarding ▁the ▁specific ▁formats ▁and ▁model ing ▁techniques . ▁ ▁The ▁ ▁Do D AF ▁des k book ▁provides ▁examples ▁in ▁using ▁traditional ▁systems ▁engineering ▁and ▁data ▁engineering ▁techniques , ▁and ▁second ly , ▁U ML ▁format . ▁Do D AF ▁proc laim s ▁latitude ▁in ▁work ▁product ▁format , ▁without ▁profess ing ▁one ▁diagram ming ▁technique ▁over ▁another . ▁ ▁In ▁addition ▁to ▁graph ical ▁representation , ▁there ▁is ▁typically ▁a ▁requirement ▁to ▁provide ▁metadata ▁to ▁the ▁Def ense ▁Information ▁Technology ▁Port folio ▁Re pository ▁( D IT PR ) ▁or ▁other ▁architect ural ▁repositories . ▁ ▁Meta - model ▁Do D AF ▁has ▁a ▁meta - model ▁under pin ning ▁the ▁framework , ▁defining ▁the ▁types ▁of ▁mod elling ▁elements ▁that ▁can ▁be ▁used