<?xml version="1.0" encoding="GB2312" ?> 
<!DOCTYPE library[
    <!ELEMENT library (title,book*,address)>
    <!ELEMENT title (#PCDATA)>
    <!ELEMENT book (#PCDATA)>
    <!ELEMENT address (#PCDATA)>
 ]>
<library>
    <title>阿當網(wǎng)上書店</title>
    <book>XML實例應用大全</book>
    <book>XML實例應用集錦</book>
    <address>書店URL：http://www.adam_bookstore.net</address>
    <book>XML實例祥解</book>
    <book>XML入門到精通</book>
</library>