如何制定 XSD

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XML documents can have a reference to a DTD or to an XML Schema.
XML文档能和一份DTD或XML Schema文件相关联。

A Simple XML Document
一份简单的XML文档

Look at this simple XML document called "note.xml":
请看下面名为"note.xml"的一份简易的XML文档

<?xml version="1.0"?><note><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>

A DTD File
一份DTD文件

The following example is a DTD file called "note.dtd" that defines the elements of the XML document above ("note.xml"):
下面的例子是名为"note.dtd"的DTD文件，它定义了上述XML文档("note.xml")的元素。

<!ELEMENT note (to, from, heading, body)><!ELEMENT to (#PCDATA)><!ELEMENT from (#PCDATA)><!ELEMENT heading (#PCDATA)><!ELEMENT body (#PCDATA)>

The first line defines the note element to have four child elements: "to, from, heading, body".
第一行定义了含有"to, from, heading, body".四个子元素的“note”元素。

Line 2-5 defines the to, from, heading, body elements to be of type "#PCDATA".
第2到5行定义了"#PCDATA". 类型的“to, from, heading, body”四个元素

An XML Schema
一份XML Schema

The following example is an XML Schema file called "note.xsd" that defines the elements of the XML document above ("note.xml"):
下面的例子当中，一个名为"note.xsd"的XML Schema文件定义了上述XML文档（"note.xml"）中的元素

<?xml version="1.0"?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"targetNamespace="http://www.w3schools.com"xmlns="http://www.w3schools.com"elementFormDefault="qualified">

<xs:element name="note">    <xs:complexType>      <xs:sequence><xs:element name="to" type="xs:string"/><xs:element name="from" type="xs:string"/><xs:element name="heading" type="xs:string"/><xs:element name="body" type="xs:string"/>      </xs:sequence>    </xs:complexType></xs:element>

</xs:schema>

The note element is a complex type because it contains other elements. The other elements (to, from, heading, body) are simple types because they do not contain other elements. You will learn more about simple and complex types in the following chapters.
Note元素是复合类型（complex type）因为它包含了其他元素，其他元素（to, from, heading, body）属于简单类型（simple type），因为它不包含其他元素。在下面几章里你会学到更多关于简单类型和复合类型的相关知识。

A Reference to a DTD
和DTD相关

This XML document has a reference to a DTD:
XML文档和DTD相关：

<?xml version="1.0"?>

<!DOCTYPE note SYSTEM"http://www.w3schools.com/dtd/note.dtd">

<note><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>

A Reference to an XML Schema
和XML Schema相关

This XML document has a reference to an XML Schema:
下面的XML文档和XML Schema相关：

<?xml version="1.0"?>

<notexmlns="http://www.w3schools.com"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.w3schools.com note.xsd"><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>

如何制定 XSD

A Simple XML Document一份简单的XML文档

A DTD File一份DTD文件

An XML Schema 一份XML Schema

A Reference to a DTD和DTD相关

A Reference to an XML Schema和XML Schema相关

A Simple XML Document
一份简单的XML文档

A DTD File
一份DTD文件

An XML Schema
一份XML Schema

A Reference to a DTD
和DTD相关

A Reference to an XML Schema
和XML Schema相关