All the rest of your XPath work will proceed from this class, though, so as simple as this looks, get used to typing it.
所有其他的XPath处理工作都要从这个类开始，虽然看起来简单，但是应该习惯于输入这些代码。
But second, it is maybe the most important thing you'll take from this class. The notion of embracing stillness.
第二，这可能是从本课程中学到的最重要的东西，即享受安静这一理念。
Returns the collection of all classes derived from this class, asynchronously.
以非同步方式传回衍生自此类别之所有类别的集合。
To use this implementation you must derive from this class and implement the abstract methods.
若要使用此实现，必须从此类派生并实现抽象方法。
Classes that inherit from this class can override this method to perform additional tasks when the event occurs.
从此类继承的类可以重写此方法，以便在发生该事件时执行其他任务。
If the event handler requires state information, you must create a derived class from this class to hold the data.
如果事件处理程序需要状态信息，则必须创建此类的派生类来保存数据。
You can inherit from this class if you want to use a custom validator provider or a third-party validator that uses attribute-based metadata.
如果您要使用自定义验证程序提供程序或第三方验证程序（该程序使用基于特性的元数据），可以从此类继承。
Controls that inherit from this class can track the active control they contain, even when the focus moves somewhere within a different container.
从该类继承的控件可以跟踪它们包含的活动控件，即使焦点移动到不同容器内的某个位置。
Most KDE applications will derive from this class as it provides an easy way to define menu and toolbar layouts through XML files (this technology is called XMLGUI).
大多数KDE应用程序会衍生此类别，因为它提供了一个简单的方法，透过XML档案定义选单和工具列的排版(这种技术称为XMLGUI)。
Most KDE applications will derive from this class as it provides an easy way to define menu and toolbar layouts through XML files (this technology is called XMLGUI).
大多数KDE应用程序会衍生此类别，因为它提供了一个简单的方法，透过XML档案定义选单和工具列的排版(这种技术称为XMLGUI)。
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