This is more of an advanced topic and useful when you don't want to tie your plug-in to a specific implementation.
这是一个更高级的主题，并且在不需要把您的插件与特定实现绑定在一起时十分有用。
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Using the plug-link mechanism in the WSFL global model, you provide the engine with the information necessary to perform the operation and tie that back into the business process being executed.