The most important part of the partner description is the service link type; it is a mechanism used to tie the Partner description to the operations the partners can perform from the WSDL definition.
Data link relies on a single method, link, to tie together input elements on a form and the target object.
Data link通过一个名为link的方法，来将表单中的input元素和目标对象绑定在一起。
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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.