public LibraryCodeSystemComponent addCodeSystem() { //3
      LibraryCodeSystemComponent t = new LibraryCodeSystemComponent();
      if (this.codeSystem == null)
        this.codeSystem = new ArrayList<LibraryCodeSystemComponent>();
      this.codeSystem.add(t);
      return t;
    }
public LibraryCodeSystemComponent addCodeSystem ( ) { LibraryCodeSystemComponent t = new LibraryCodeSystemComponent ( ) ; if ( this . codeSystem == null ) this . codeSystem = new ArrayList < LibraryCodeSystemComponent > ( ) ; this . codeSystem . add ( t ) ; return t ; }
syntactic sugar