分析DTD文檔，寫XML實例（簡單；自我講解）

DTD文檔如下：

文檔名稱：Newspaper.dtd 

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT NEWSPAPER (ARTICLE+)> 
<!-- 上面這句表明根元素爲NEWSPAPER，該元素裏面至少有一個ARTICLE元素 --> 
<!ELEMENT ARTICLE (HEADLINE, BYLINE, LEAD, BODY, NOTES)>
<!-- 上面這句表明ARTICLE元素下有五個元素，依次爲HEADLINE, BYLINE, LEAD, BODY, NOTES -->  
<!ELEMENT HEADLINE (#PCDATA)>
<!ELEMENT BYLINE (#PCDATA)>
<!ELEMENT LEAD (#PCDATA)>
<!ELEMENT BODY (#PCDATA)>
<!ELEMENT NOTES (#PCDATA)>
<!-- 上面這五句可以看出五個元素被定義爲字符串類型 --> 


<!ATTLIST ARTICLE AUTHOR CDATA #REQUIRED>
<!-- 上面這句可以看出ARTICLE的AUTHOR參數是不可或缺的 -->  
<!ATTLIST ARTICLE EDITOR CDATA #IMPLIED>
<!ATTLIST ARTICLE DATE CDATA #IMPLIED>
<!ATTLIST ARTICLE EDITION CDATA #IMPLIED>
<!-- 上面這三句可以看出這三個ARTICLE的參數是可選的 -->  

XML實例： 

 文檔名稱：Newspaper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE NEWSPAPER SYSTEM "Newspaper.dtd">
<NEWSPAPER>
        <ARTICLE AUTHOR="梅夫">
                <HEADLINE/>
                <BYLINE/>
                <LEAD/>
                <BODY/>
                <NOTES/>
        </ARTICLE>
 
        <ARTICLE AUTHOR="雷傑">
                <HEADLINE/>
                <BYLINE/>
                <LEAD/>
                <BODY/>
                <NOTES/>
          </ARTICLE>
</NEWSPAPER>