public void deleteExecutionPath() {
   if (!executionPaths.containsKey(executionPath)) {
     throw new IllegalStateException();
   }
   executionPaths.remove(executionPath);
   executionPath = LiteWorkflowInstance.getParentPath(executionPath);
 }
 public String getParentExecutionPath(String executionPath) {
   return LiteWorkflowInstance.getParentPath(executionPath);
 }