PDFLib-Lite：下载开源版本的 PDFLib 7 并探索其功能子集。
PDFLib-Lite:Download an open source version of the PDFLib 7 and explore its functionality subset.
某些情况下，一个模块的依赖可以是可选的；换句话说，该模块可能有一个功能子集缺少依赖。
In some cases, a module's dependencies can be optional; that is, the module can provide a subset of functionality with missing dependencies.
唯一的主要差别是我们将选择 Web service client 向导，它只是我们前面所用的 Web service 向导的一个功能子集。
The only major difference is that we will select the Web service client wizard, which is simply a functional subset of the Web service wizard we used before.
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