根据以下内容@startuml |用户| start :下单; |系统| if (订单信息正确?) then (是) :生成订单; |仓库| if (有库存?) then (是) :分配库存; |快递员| if (接单?) then (是) :派送; else (否) :取消订单; endif else (否) :取消订单; endif else (否) :提示用户订单信息错误; stop endif |用户| :签收; stop @enduml帮我绘制一份派送模块的系统用例图，用plantuml语言规范表示

好的，这是绘制派送模块的系统用例图的 PlantUML 代码：

@startuml
left to right direction
skinparam packageStyle rectangle

actor "用户" as user
rectangle "派送模块" {
  usecase "录入派送信息" as enter
  usecase "查询派送信息" as query
  usecase "修改派送信息" as modify
  usecase "删除派送信息" as delete
  usecase "派送" as dispatch
  usecase "取消派送" as cancel_dispatch
  usecase "签收" as sign

  user --> dispatch
  dispatch --> enter
  dispatch --> modify
  dispatch --> cancel_dispatch
  dispatch --> sign
  enter --> query
  enter --> modify
  enter --> delete
}

@enduml

用例图如下所示：