Page 充当所有页面的抽象基类并可包含 Component 的任意树。
Page acts as an abstract base class for all pages and can contain any arbitrary tree of Components.
如果主应用类是在基项目(这里是Warsaw)里定义的，那依赖应用(Global)就不能添加新的Web页面了。
If this main application class is defined in the base project (Warsaw in this case), then we cannot add new web pages in the dependent applications (Global).
该页面首先通过标记的sr c属性引入基类。
This page starts by bringing in the base classes through the SRC items on the tags.
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