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XML AJAX

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XML DOM

DOM简介归纳 DOM节点 DOM访问 DOM节点信息 DOM节点列表 DOM遍历 DOM导航 DOM获取价值 DOM变更节点 DOM删除节点 DOM替换节点 DOM创建节点 DOM添加节点 DOM克隆节点 DOM 示例

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XML DTD

DTD简介 DTD构建基块 DTD元素 DTD属性 DTD元素 vs Attr DTD实体 DTD 示例

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参考

DOM节点类型 DOM节点 DOM节点List DOM NamedNodeMap DOM文档 DOM元素 DOM属性 DOM文字 DOM CDATA DOM评论 DOM XMLHttpRequest DOM解析器 XSLT元素 XSLT / XPath函数

XML Schema


An XML模式 describes the structure of an XML document, just like a DTD.

An XML document with correct syntax is called "Well Formed".

An XML document validated against an XML模式 is both "Well Formed" and "Valid".


XML模式

XML模式 is an XML-based alternative to DTD:

<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>

The Schema above is interpreted like this:

  • <xs:element name="note"> defines the element called "note"
  • <xs:complexType> the "note" element is a complex type
  • <xs:sequence> the complex type is a sequence of elements
  • <xs:element name="to" type="xs:string"> the element "to" is of type string (text)
  • <xs:element name="from" type="xs:string"> the element "from" is of type string
  • <xs:element name="heading" type="xs:string"> the element "heading" is of type string
  • <xs:element name="body" type="xs:string"> the element "body" is of type string

XML模式s are More Powerful than DTD

  • XML模式s are written in XML
  • XML模式s are extensible to additions
  • XML模式s support data types
  • XML模式s support namespaces


Why Use an XML模式?

With XML模式, your XML files can carry a description of its own format.

With XML模式, independent groups of people can agree on a standard for interchanging data.

With XML模式, you can verify data.


XML模式s Support Data Types

One of the greatest strengths of XML模式s is the support for data types:

  • It is easier to describe document content
  • It is easier to define restrictions on data
  • It is easier to validate the correctness of data
  • It is easier to convert data between different data types

XML模式s use XML语法

Another great strength about XML模式s is that they are written in XML:

  • You don't have to learn a new language
  • You can use your XML editor to edit your Schema files
  • You can use your XML parser to parse your Schema files
  • You can manipulate your Schemas with the XML DOM
  • You can transform your Schemas with XSLT

If you want to study XML模式, please read our XML模式 Tutorial.





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