定义由环境实作的介面，该环境装载工作流程设计工具和编译器，以便在验证和编译处理程序期间，提供环境特定的编译资讯。
Defines the interface implemented by the environment hosting the workflow designer and compiler to provide environment-specific compilation information during the validation and compilation processes.
控制项的建立是为了服务特定目的，而撰写控制项只是另一个程序设计工作。
Controls are created to serve specific purposes, and authoring controls is just another programming task.
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