▁is ▁presented ▁by ▁Kat if ori ▁et ▁al . ▁An ▁updated ▁survey ▁of ▁ont ology ▁visual ization ▁methods ▁and ▁tools ▁was ▁published ▁by ▁D ud ás ▁et ▁al . ▁The ▁most ▁established ▁ont ology ▁visual ization ▁methods , ▁namely ▁ind ented ▁tree ▁and ▁graph ▁visual ization ▁are ▁evaluated ▁by ▁Fu ▁et ▁al . ▁A ▁visual ▁language ▁for ▁ont ologies ▁represented ▁in ▁O W L ▁is ▁specified ▁by ▁the ▁Visual ▁Not ation ▁for ▁O W L ▁Ont ologies ▁( V OW L ). ▁ ▁Engineering ▁▁ ▁Ont ology ▁engineering ▁( also ▁called ▁ont ology ▁building ) ▁ ▁is ▁a ▁set ▁of ▁tasks ▁related ▁to ▁the ▁development ▁of ▁ont ologies ▁for ▁a ▁particular ▁domain . ▁It ▁is ▁a ▁sub field ▁of ▁knowledge ▁engineering ▁that ▁studies ▁the ▁ont ology ▁development ▁process , ▁the ▁ont ology ▁life ▁cycle , ▁the ▁methods ▁and ▁method ologies ▁for ▁building ▁ont ologies , ▁and ▁the ▁tools ▁and ▁languages ▁that ▁support ▁them . ▁ ▁Ont ology ▁engineering ▁a ims ▁to ▁make ▁explicit ▁the ▁knowledge ▁contained ▁in ▁software ▁applications , ▁and ▁organiz ational ▁procedures ▁for ▁a ▁particular ▁domain . ▁Ont ology ▁engineering ▁offers ▁a ▁direction ▁for ▁over coming ▁semantic ▁obst acles , ▁such ▁as ▁those ▁related ▁to ▁the ▁definitions ▁of ▁business ▁terms ▁and ▁software ▁classes . ▁Kn own ▁challeng es ▁with ▁ont ology ▁engineering ▁include : ▁ ▁Ens uring ▁the ▁ont ology ▁is ▁current ▁with ▁domain ▁knowledge ▁and ▁term ▁use ▁ ▁Prov iding ▁sufficient ▁specific ity ▁and ▁concept ▁coverage ▁for ▁the ▁domain ▁of ▁interest , ▁thus ▁minim izing ▁the ▁content ▁comple ten ess