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进阶day13-XML的约束文件-DTD

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xuxin
2026-04-11 13:40:51 +08:00
parent 4e2f6f6f5d
commit 0b31c10927
3 changed files with 59 additions and 6 deletions
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javaSE-day13/books.xml
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@@ -6,21 +6,47 @@ XML的基本语法:
3.XML有且仅有一个根标签
4.标签体:可以是子标签也可以是文本
5.开始标签中可以设置属性的
____________________________________________________________________
XML可以自定义标签,这样的话它的标签名可以设置很多不同的,这样导致我们在解析的时候不便于解析
XML引入了约束文件,限制XML的编写一定按照模板去编写.
XML的约束文件有2种：
dtd约束
schema约束
-->
<!--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 "j">
]>-->
<!--外部dtd约束文件引入-->
<!DOCTYPE books SYSTEM "books.dtd">
<books>
<book>
<name bid="j10">java快速入门1</name>
<book bid="j10">
<name>java快速入门1</name>
<price>99</price>
<author>张三</author>
</book>
<book>
<name bid="j15">java快速入门2</name>
<book bid="j10">
<name>java快速入门1</name>
<price>99</price>
<author>张三</author>
</book>
<book>
<name>java快速入门3</name>
<book bid="j10">
<name>java快速入门1</name>
<price>99</price>
<author>张三</author>
</book>
<book bid="j10">
<name>java快速入门1</name>
<price>99</price>
<author>张三</author>
</book>
</books>