null string

常见例句

The CLP recognizes 'NULL' (specified in uppercase characters) as a null string. For example
CLP 将“NULL”（以大写字符指定）识别为空字符串。
If a page action method invocation returns a non-null string value, Seam treats it as a navigation event.
如果页面动作方法调用返回一个非空字符串值，则 Seam 将其当作一个导航事件。
The default namespace is initialized to be no namespace-URI at all, so there is a syntax for undefining a previously-defined default namespace by assigning it to the null string.
对缺省名称空间初始化，使之完全不是名称空间 URI，这样就存在一个语法，它通过向以前定义的缺省名称空间分配空字符串来取消对该名称空间的定义。

NULL If a get string returns null, that pretty much means something went wrong and there are a few things that could go wrong.
如果GetSting返回，大致上表示的是出错了,这里有几种出错的地方。
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