xml dtd schema基础

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本文介绍了一个具体的 XML 文档类型定义 (DTD) 示例。该 DTD 定义了用于描述个人资料的数据结构，包括姓名、外貌特征、财产等元素。通过对这些元素的详细规定，DTD 为后续的 XML 文档提供了严格的格式规范。


<?xml version="1.0" standalone='yes'?>
     <!DOCTYPE people [
     <!ELEMENT people (person+)>
     <!ELEMENT person (#PCDATA)>
     ]>


<!ELEMENT people (person+)>
<!ELEMENT person (name, look*, possession?, other?)>
<!ELEMENT name (firstname, lastname)>
<!ELEMENT firstname (#PCDATA)>
<!ELEMENT lastname (#PCDATA)>
<!ELEMENT look (#PCDATA)>
<!ELEMENT possession (car?, house?, bankaccount?, job?)>
<!ELEMENT car (#PCDATA|model)*>
<!ELEMENT model (#PCDATA)>
<!ELEMENT house (apartment|standalone|townhouse)>
<!ATTLIST house house_area ID #IMPLIED country CDATA #FIXED 
"CANADA" city CDATA #IMPLIED>
<!ELEMENT apartment EMPTY>
<!ELEMENT standalone EMPTY>
<!ELEMENT townhouse EMPTY>
<!ATTLIST townhouse townhouse_type ID #IMPLIED>
<!ELEMENT bankaccount (#PCDATA)>
<!ATTLIST bankaccount bankaccount_number ID #REQUIRED>
<!ELEMENT job (#PCDATA)>
<!ELEMENT other ANY>
<!ENTITY IBM "Proud to work for IBM">

[url]http://www.ibm.com/developerworks/cn/xml/x-dtdint/#resources[/url]
[url]http://www.w3school.com.cn/schema/schema_intro.asp[/url]
[url]http://wenku.baidu.com/view/6a4ae90c844769eae009ed9f.html[/url]
[url]http://www.w3school.com.cn/xml/xml_namespaces.asp[/url]