In other products you should look out for external libraries.
在其他产品的情况下，你需要查找外部的资源库。
This file does not, however, include external libraries such as Xalan and Xerces.
但是，这个文件不包含诸如xalan和Xerces等外部库。
Newer class additions and some external libraries use multiple classes to form a library for functionality.
新的附加类和一些外部的库使用多种类来组成有某种功能的库。
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