docs: @Override
      public void perform(GraphRewrite event, EvaluationContext context)
      {
          checkVariableName(event, context);
          WindupVertexFrame payload = resolveVariable(event, getVariableName());
          if (payload instanceof FileReferenceModel)
          {
              FileModel file = ((FileReferenceModel) payload).getFile();
              perform(event, context, (XmlFileModel) file);
          }
          else
          {
              super.perform(event, context);
          }
  
      }