请为某一部分程序写pdl

好的，我以航班信息管理模块为例，为您编写一段PDL代码。

航班信息管理模块主要实现航班信息的添加、查询、修改、删除等功能。以下是该模块的PDL代码：

Module: Flight Info Management
Description: This module is responsible for managing flight information, including adding, querying, modifying and deleting flight information.

Data:
- FlightNumber: string
- Departure: string
- Destination: string
- DepartureTime: datetime
- TicketPrice: float

Process:
- AddFlightInfo
    Input: FlightNumber, Departure, Destination, DepartureTime, TicketPrice
    Output: Success or Failure
    Description: Add new flight information to the system.

- QueryFlightInfo
    Input: FlightNumber
    Output: Flight information (FlightNumber, Departure, Destination, DepartureTime, TicketPrice)
    Description: Query flight information by flight number.

- ModifyFlightInfo
    Input: FlightNumber, Departure, Destination, DepartureTime, TicketPrice
    Output: Success or Failure
    Description: Modify flight information by flight number.

- DeleteFlightInfo
    Input: FlightNumber
    Output: Success or Failure
    Description: Delete flight information by flight number.

以上是航班信息管理模块的PDL代码，该代码描述了该模块的数据和各个功能的输入输出以及功能的描述，有助于开发人员更好地理解和实现该模块。