code: public NodeData createAnonymousStyle(String display)
      {
          NodeData ret = CSSFactory.createNodeData();
          
          Declaration cls = CSSFactory.getRuleFactory().createDeclaration();
          cls.unlock();
          cls.setProperty("class");
          cls.add(CSSFactory.getTermFactory().createString("Xanonymous"));
          ret.push(cls);
          
          Declaration disp = CSSFactory.getRuleFactory().createDeclaration();
          disp.unlock();
          disp.setProperty("display");
          disp.add(CSSFactory.getTermFactory().createIdent(display));
          ret.push(disp);
          
          return ret;
      }
docs: Creates the style definition for an anonymous box. It contains only the class name set to "Xanonymous"
  and the display: property set according to the parametres.
  @param display <code>display:</code> property value of the resulting style.
  @return Resulting style definition