public CodeType addBaseElement() {//2 
      CodeType t = new CodeType();
      if (this.base == null)
        this.base = new ArrayList<CodeType>();
      this.base.add(t);
      return t;
    }
public CodeType addBaseElement ( ) { CodeType t = new CodeType ( ) ; if ( this . base == null ) this . base = new ArrayList < CodeType > ( ) ; this . base . add ( t ) ; return t ; }
@return {@link #base} (The base resource type(s) that this search parameter can be used against.)