<?xml version="1.0" encoding="UTF-8" ?> 
- <CALIS_book:book xi:schemaLocation="http://www.calis.edu.cn/metadata_ns/1.0/book/ http://www.calis.edu.cn/metadata_ns/1.0/book/book.xsd" xmlns:CALIS_book="http://www.calis.edu.cn/metadata_ns/1.0/book/" xmlns:xi="http://www.w3.org/2001/XMLSchema-instance">
- <CALIS_book:extInfo>
  <CALIS_book:calisSource>全文=http://211.151.90.240/usp/Apabi_USP/interface.mvc?api=onlineread&metaid=ISBN7-5053-8600-X&objectid=ISBN7-5053-8600-X.ft.CEBX.1&page=1</CALIS_book:calisSource> 
  </CALIS_book:extInfo>
  </CALIS_book:book>
请各位大虾赐教如何用Ajax解析上面格式的XML呀?