Apache用于操作XML的包，底层使用DOM4J，封装后操作更加直观，简便易用，和Struts是孪生兄弟。-XML for the operation of the Apache package, use the bottom DOM4J, after packaging operation more intuitive, easy-to-use, and is the twin brother of Struts.

Digester 就是让你配置一个 XML 转到 Java Object 对应的程序，或者说是解析 XML 的工具。-Allows you to configure the Digester is an XML to Java Object corresponding procedures, or analytical tools for XML.