XML外部实体注入--XML基础
<?xml version="1.0" encoding="UTF-8"?> <!--XML 声明-->
<!DOCTYPE bookstore [
<!ELEMENT book (title, author, price)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ATTLIST book category CDATA "fiction">
]>
<bookstore>
<book category="science">
<title>XML 基础教程</title>
<author>张三</author>
<price>30.00</price>
</book>
<book>
<title>Java 编程指南</title>
<author>李四</author>
<price>50.00</price>
</book>
</bookstore>