The wordform_handler class has an initializer and keeps track of the parameter passed in to determine whether to apply XSLT to XML results.
wordform_handler类有一个初始化器，并记录传递的参数，决定是否对XML结果应用XSLT。
Sites such as Facebook, track user clicks by adding the "ref" parameter to each navigational element. Below is an example of how Facebook links their logo.
拿Facebook为例，它为每一个导航元素增加了“ref”属性来跟踪用户点击。
The two constructors both need a reference of an object, and the second constructor needs one more, a parameter of boolean type to indicate whether we need to track the resurrection of the object.
此二构造函数都需要一个对象的引用，第二个构造函数还需要一个布尔值参数来表示我们是否需要跟踪对象的重生。
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