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xuxin
2025-12-21 17:24:54 +08:00
commit e8c50a3d78
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<?xml version="1.0" encoding="utf-8" ?>
<!--dtd约束文件的内部引入-->
<!--<!DOCTYPE books [
<!ELEMENT books (book+)>
<!ELEMENT book (name,price,author)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ATTLIST book bid CDATA "check">
]>-->
<!--dtd约束文件的外部引入-->
<!DOCTYPE books SYSTEM "books.dtd">
<books>
<book bid="j">
<name>java入门到精通</name>
<price>999</price>
<author>小王</author>
</book>
<book bid="s">
<name>数据库从删库到跑路</name>
<price>666</price>
<author>老王</author>
</book>
</books>