text: // Interfaces.
  
  var Composite = new Interface('Composite', ['add', 'remove', 'getChild']);
  var FormItem = new Interface('FormItem', ['save']);
  
  // CompositeForm class
  
  var CompositeForm = function(id, method, action) { // implements Composite, FormItem
     //todo
  };
  
  //todo
  
  function addForm(formInstance) {
      Interface.ensureImplements(formInstance, Composite, FormItem);
      // This function will throw an error if a required method is not implemented,
      // halting execution of the function.
      // All code beneath this line will be executed only if the checks pass.
      //todo
  }	
  