历史证明，保证SQL成功的最重要的一个特性就是它使用类似英语的语法轻松地检索数据的能力。
Arguably, though, the single most important feature of SQL that has solidified its success is its capability to retrieve data easily using English-like syntax.
通过单一调用进行实际的语法分析和文档构造，如果成功完成了这一操作，那么应用程序就可以检索并使用已构造的Document。
The actual parsing and document construction takes place with a single call, and if this completes successfully, the constructed document can then be retrieved and used by the application.
您还可以使用xpath语法来检索消息的内容。
You can also use an XPath syntax to retrieve the contents of a message. The following Java code accesses the first chapter element in the logical tree using the XPath syntax.
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