What is an XML
Schema?
什么是XML Schema？
The purpose of an XML Schema is
to define the legal building blocks of an XML document, just like a
DTD.
XML
Schema的作用是定义一份XML文档的合法组件群，就像DTD的作用一样
An XML Schema:
一份XML Schema
- defines elements that can
appear in a document
定义了可以出现在文档里的元素 - defines attributes that can
appear in a document
定义了可以出现在文档里的属性 - defines which elements are
child elements
定义了哪些元素是子元素 - defines the order of child
elements
定义了子元素的顺序 - defines the number of child
elements
定义了子元素的数量 - defines whether an element is
empty or can include text
定义了一个元素应是否能包含文本，或应该是空的 - defines data types for elements
and attributes
定义了元素和属性的数据类型 - defines default and fixed
values for elements and attributes
定义了元素和属性的默认值和固定值
XML Schemas are the Successors
of DTDs
XML Schema 是DTD的“接任者”
We think that very soon XML
Schemas will be used in most Web applications as a replacement for
DTDs. Here are some reasons:
我们认为XML
Schema很快就会替代DTD在大多数的网络应用程序中被广泛使用。
- XML Schemas are extensible to
future additions
XML Schema针对将来的额外内容是可扩展的 - XML Schemas are richer and more
powerful than DTDs
XML Schema内容比DTD丰富，作用也更大 - XML Schemas are written in
XML
XML Schema是以XML语言编写而成的 - XML Schemas support data
types
XML Schema支持数据类型 - XML Schemas support
namespaces
XML Schema支持名称空间（namespaces）
XML Schema is a W3C
Standard
XML Schema是W3C定义的标准
XML Schema became a W3C
Recommendation 02. May 2001.
XML Schema于2001年5月2日成为W3C推荐使用的标准
You can read more about the XML
Schema standard in our .
在W3C 教程中你能阅读到更多关于XML Schema标准。
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