53 lines
1.5 KiB
XML
53 lines
1.5 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<!--
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XML的基本语法:
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1.XML都是基于标签
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2.标签:<开始标签>标签体</结束标签>
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3.XML有且仅有一个根标签
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4.标签体:可以是子标签也可以是文本
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5.开始标签中可以设置属性的
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____________________________________________________________________
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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
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XML引入了约束文件,限制XML的编写一定按照模板去编写.
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XML的约束文件有2种：
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dtd约束
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schema约束
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-->
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<!--dtd约束文件的内部引入-->
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<!--<!DOCTYPE books [
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<!ELEMENT books (book+)>
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<!ELEMENT book (name,price,author)>
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<!ELEMENT name (#PCDATA)>
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<!ELEMENT price (#PCDATA)>
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<!ELEMENT author (#PCDATA)>
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<!ATTLIST book bid CDATA "j">
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]>-->
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<!--外部dtd约束文件引入-->
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<!DOCTYPE books SYSTEM "books.dtd">
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<books>
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<book bid="j10">
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<name>java快速入门1</name>
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<price>99</price>
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<author>张三</author>
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</book>
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<book bid="j10">
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<name>java快速入门1</name>
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<price>99</price>
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<author>张三</author>
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</book>
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<book bid="j10">
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<name>java快速入门1</name>
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<price>99</price>
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<author>张三</author>
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</book>
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<book bid="j10">
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<name>java快速入门1</name>
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<price>99</price>
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<author>张三</author>
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</book>
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</books>
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