▁in ▁each ▁view ▁and ▁the ▁relationships ▁between ▁them . ▁Do D AF ▁versions ▁ 1 . 0 ▁th ru ▁ 1 . 5 ▁used ▁the ▁C AD M ▁meta - model , ▁which ▁was ▁defined ▁in ▁IDE F 1 X ▁( then ▁later ▁in ▁U ML ) ▁with ▁an ▁XML ▁Sch ema ▁derived ▁from ▁the ▁resulting ▁rel ational ▁database . ▁From ▁version ▁ 2 . 0 , ▁Do D AF ▁has ▁adopted ▁the ▁IDE AS ▁Group ▁foundation ▁ont ology ▁as ▁the ▁basis ▁for ▁its ▁new ▁meta - model . ▁This ▁new ▁meta - model ▁is ▁called ▁" DM 2 "; ▁an ▁ac ron ym ▁for ▁" Do D AF ▁Meta - Model ". ▁Each ▁of ▁these ▁three ▁levels ▁of ▁the ▁DM 2 ▁is ▁important ▁to ▁a ▁particular ▁vie wer ▁of ▁Department al ▁processes : ▁The ▁concept ual ▁level ▁or ▁Con cept ual ▁Data ▁Model ▁( CD M ) ▁defines ▁the ▁high - level ▁data ▁construct s ▁from ▁which ▁Arch itect ural ▁Descri ptions ▁are ▁created ▁in ▁non - techn ical ▁terms , ▁so ▁that ▁execut ives ▁and ▁man agers ▁at ▁all ▁levels ▁can ▁understand ▁the ▁data ▁basis ▁of ▁Arch itect ural ▁Description . ▁Represent ed ▁in ▁the ▁Do D AF ▁V 2 . 0 ▁D IV - 1 ▁View point . ▁The ▁Log ical ▁Data ▁Model ▁( LD M ) ▁adds ▁technical ▁information , ▁such ▁as ▁attributes ▁to ▁the ▁CD M ▁and , ▁when ▁necessary , ▁clar ifies ▁relationships ▁into ▁an ▁un ambigu ous ▁usage ▁definition . ▁Represent ed ▁in ▁the ▁Do D