非常实用的系统架构模式，以树结构构建系统架构，即插即用的模式，能够实现复杂对象系统，来自于项目的实例，极具参考价值。包括对父子节点的操作。-Very practical system architecture model, a tree structure to build the system architecture, plug and play mode, complex objects, in the instance of the project, great reference value. Including the operation of the parent-child node.