用于把跟踪文本传递给插件解析器的子元素msg可以任意地选择，也可以使用其它任意的元素名称。
The sub element Msg which is used to pass the trace text to the plug-in parser is chosen arbitrarily, any other element name can be used.
JSF和Spring都是“轴心”技术的范例，每一项技术都采用了可以轻易访问子框架的插件结构。
JSF and Spring are both examples of "hub" technologies, each sporting a plug-in architecture that puts many sub-frameworks within easy reach.
对于描述这个插件可能依赖于其他插件的父-兄-子关系，树状视图是最合适的一种UI。
A tree view is one of the best-suited UIs to describe the parent-sibling-child kind of relationships plug-ins have when they depend on other plug-ins.
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