从门户的角度看，基于功能的评估可能最易于理解。
Function based estimation is probably the easiest to understand from a portal perspective.
而且，还要在这里指定产品配置单元是基于插件还是基于功能的。
What's more, it is specified whether the product configuration unit is based on plug-in or feature.
使用BPEL4WS的条件和调用结构，您可以动态或静态地选择基于功能的服务。
Using BPEL4WS's conditional and invocation constructs, you can select feature-based services dynamically or statically.
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