修改程序不知道哪里出错了

   <!ELEMENT bookcase  (b-name, author, price, publishing-house)>

   <!ELEMENT b-name  (#PCDATA)>

   <!ELEMENT author (pname,  E-mail)>

   <!ELEMENT price  (#PCDATA)>

   <!ELEMENT name  (#PCDATA)>

   <!ELEMENT E-mail  (#PCDATA)>

   <!ELEMENT  publishing-house (p-name, address, zipcode, E-mail)>

   <!ELEMENT p-name  (#PCDATA)>

   <!ELEMENT address  (#PCDATA)>

 

   <!ELEMENT zipcase  (#PCDATA)>

]>

   <book >

          <b_name>XML实用培训教程</b_name>

          <author>

                 <name>张健飞</name>

                 <E-mail>zjf@163.com</E-mail>

          </author>

          <price>27元</price>

          <publishing-house>

                 <p-name>科学出版社</p-name>

                 <address>北京东皇城根北街16号</address>

                 <zipcode>100717</zipcode>

                 <E-mail>yanmc@bhp.com.cn</E-mail>

          </publishing-house>

   </book>

   <book >

          <b-name>XML网页制作彻底研究</b-name>

          <author>

                 <name>陈会安</name>

                 <E-mail>cha@163.com</E-mail>

          </author>

          <price>47元</price>

   </book>

原题,对照xml格式去补吧，缺什么补什么。