apex create or truncate collection

1BEGIN
2  IF NOT APEX_COLLECTION.COLLECTION_EXISTS('EMPLOYEE_CL') THEN
3      APEX_COLLECTION.CREATE_COLLECTION('EMPLOYEE_CL');
4  ELSE
5      APEX_COLLECTION.TRUNCATE_COLLECTION('EMPLOYEE_CL');
6  END IF;
7  -- Or
8  APEX_COLLECTION.CREATE_OR_TRUNCATE_COLLECTION('EMPLOYEES_CL');
9END;