XML Schema

xml文件的基本实例：

<?xml version="1.0" encoding="utf-8" ?>
<notes xmlns="http://www.robchen.cn/news" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.robchen.cn/news newsSchema.xsd">
  <note>
    <title>HTML</title>
    <summary>Learning HTML</summary>
    <author>
      <name>Susan Smith</name>
      <sex>female</sex>
    </author>
    <tags>HTML CSS</tags>
    <hit date="2007-11-17">267</hit>
    <url>http://www.robchen.cn/news/HTML.html</url>
  </note>
  <note postDate="2007-11-17">
    <title>Ajax</title>
    <summary>Learning Ajax</summary>
    <author>
      <sex>male</sex>
      <name>Robin Chen</name>
      <age>22</age>
    </author>
    <tags>Ajax JavaScript XML JSON</tags>
    <hit date="2007-11-17">854</hit>
    <url>http://www.robchen.cn/news/JSON.html</url>
  </note>
  <note>
    <title>XML Schema</title>
    <summary>Something About the XML Schema</summary>
    <comment>Nice</comment>
    <author>
      <name>Robin Chen</name>
      <age>22</age>
    </author>
    <url>http://www.robchen.cn/news/XMLSchema.htm</url>
  </note>
</notes>

对应的xsd文件，也就是newsSchema.xsd文件：

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="XMLSchema1" targetNamespace="http://www.robchen.cn/news" elementFormDefault="qualified" xmlns="http://www.robchen.cn/news" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="notes" type="Notes">
  </xs:element>
  <xs:element name="comment" type="xs:string">
  </xs:element>
  <xs:complexType name="Notes">
    <xs:sequence>
      <xs:element name="note" type="Note" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="Note">
    <xs:sequence>
      <xs:element name="title" type="xs:string" />
      <xs:element name="summary" type="xs:string" />
      <xs:element ref="comment" minOccurs="0" />
      <xs:element name="author" type="AuthorType" maxOccurs="unbounded" />
      <xs:element name="tags" type="TagsType" minOccurs="0" />
      <xs:element name="hit" type="HitType" default="0" minOccurs="0" />
      <xs:element name="url" type="UrlType" />
    </xs:sequence>
    <xs:attribute name="postDate" default="2007-11-17" type="xs:date" />
  </xs:complexType>
  <xs:complexType name="AuthorType">
    <xs:all>
      <xs:element name="name" type="xs:string" minOccurs="1" />
      <xs:element name="sex" type="SexType" minOccurs="0" />
      <xs:element name="age" type="AgeType" minOccurs="0" />
    </xs:all>
  </xs:complexType>
  <xs:simpleType name="SexType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="male" />
      <xs:enumeration value="female" />
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="AgeType">
    <xs:restriction base="xs:integer">
      <xs:maxInclusive value="80" />
      <xs:minInclusive value="20" />
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="TagType">
    <xs:list itemType="xs:token">
    </xs:list>
  </xs:simpleType>
  <xs:simpleType name="TagsType">
    <xs:restriction base="TagType">
      <xs:minLength value="0" />
      <xs:maxLength value="10" />
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name="HitType">
    <xs:simpleContent>
      <xs:extension base="xs:nonNegativeInteger">
        <xs:attribute name="date" type="xs:date" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:simpleType name="UrlType">
    <xs:restriction base="xs:string">
      <xs:pattern value="http://www.robchen.cn/news/.*\.(html|htm)"></xs:pattern>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>