Co-existence: Any system can consist of a set of modules where each module has dependencies on other modules.
共存：任何系统都可以包含一组模块，其中每个模块都依赖于其他模块。
Each object has a level where it can be found in the formal module.
每一个对象都拥有在规范模块中可以找到的层次。
The param value associated with each of these module definitions indicates where to start to search for the Struts configuration file.
与每个模块定义关联的参数值指出在哪里开始搜索 Struts 配置文件。
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