由于两个原因，我喜欢对名称空间使用别名：首先，如果以后要改变名称空间，在每个源代码文件中只有一行需要修改。
The use of aliases is my preferred method for using namespaces for two reasons: First, if I later rename the namespace, I only have one line of code to change per source file.
导出文件中有两个日期，而 SOAP 服务器中只有一个。
The export file has two dates versus one in the SOAP server.
清单12是使用我们的text1文件的基础例子，它包含3个行，每行只有两个单词。
Listing 12 is a basic example using our text1 file, which contains three lines each having two words..
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