title: dealing with xml information of uml digram
body: <h1>i am trying to manually add new attribute to class in my class diagram modeled in Papyrus</h1>
  
  <p>and the addition that i intend is on xml file of class diagram but i don't know how can i manage the class diagram model because every model in Papyrus consists of three files :   </p>
  
  <p>
  <li>1-<em>.uml
  <li> 2-</em>.notation
  <li>3-*.di</p>
  
  <p>adding the information related to the attribute to only *.uml file  is not sufficient <br/></p>
  
  <p>My question is how can i manage those three file ?</p>