03XML Schema Definition

1. XML Schema Definition

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1. XML Schema Definition

XML Schema（XML Schema Definition，XSD）用于描述 XML 文档的结构

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">

<xs:element name="BOOKS">

<xs:annotation>

<xs:documentation>Comment describing your root element</xs:documentation>

</xs:annotation>

<xs:complexType>

<xs:sequence>

<xs:element ref="BOOK" minOccurs="1" maxOccurs="unbounded"/>

</xs:sequence>

</xs:complexType>

</xs:element>

<xs:element name="BOOK">

<xs:complexType>

<xs:sequence>

<xs:element name="TITLE" type="xs:string"/>

<xs:element name="AUTHOR" type="xs:string"/>

<xs:element name="PAGE" type="xs:int"/>

<xs:choice>

<xs:element name="PRICE" type="xs:decimal"/>

<xs:element name="DISCOUNT" type="xs:decimal"/>

</xs:choice>

</xs:sequence>

</xs:complexType>

</xs:element>

</xs:schema>

<?xml version="1.0" encoding="UTF-8"?>

<BOOKS xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="BOOKS.xsd">

<BOOK>

<TITLE>XML</TITLE>

<AUTHOR>JIM</AUTHOR>

<PAGE>30</PAGE>

<PRICE>20</PRICE>

</BOOK>

<BOOK>

<TITLE>XML</TITLE>

<AUTHOR>JIM</AUTHOR>

<PAGE>30</PAGE>

<DISCOUNT>10</DISCOUNT>

</BOOK>

<BOOK>

<TITLE>XML</TITLE>

<AUTHOR>JIM</AUTHOR>

<PAGE>30</PAGE>

<PRICE>20</PRICE>

</BOOK>

</BOOKS>