NSXMLParser解析XML问题

请问用NSXMLParser解析下面XML文件，怎么能把books存到book数组中，如：book[book1,book2,...]这样子。然后book1，book2,book3中又有title，summary，author属性。求指导。
XML文件：
<?xml version="1.0" encoding="UTF-8" ?> 
- <Books>
- <Book>
  <title>aaa</title> 
  <summary>bbb</summary> 
  <author>ccc</author> 
  </Book>
- <Book>
  <title>ddd</title> 
  <summary>eee</summary> 
  <author>fff</author> 
  </Book>
- <Book>
  <title>ggg</title> 
  <summary>hhh</summary> 
  <author>iii</author> 
  </Book>
- <Book>
  <title>jjj</title> 
  <summary>kkk</summary> 
  <author>lll</author> 
  </Book>
- <Book>
  <title>mmm</title> 
  <summary>nnn</summary> 
  <author>ooo</author> 
  </Book>
  </Books>