XForms is an XML format for the specification of a data processing model for XML data and user interface(s) for the XML data, such as web forms. XForms was designed to be the next generation of HTML / XHTML forms, but is generic enough that it can also be used in a standalone manner or with presentation languages other than XHTML to describe a user interface and a set of common data manipulation tasks.
Unlike the original HTML forms, the creators of XForms have used a Model-View-Controller approach. The "model" consists of one or more XForms models describing form data, constraints upon that data, and submissions. The "view" describes what controls appear in the form, how they are grouped together, and what data they are bound to. CSS can be used to describe a form's appearance.
Software support
At the time of this writing, no widely used web browser supports XForms natively. However, various browser plugins and client-side extensions exist.
Mobile Implementations
Oracle Wireless Client has released a preview of their Wireless Client in March 2004. Despite its name, the preview contains no software that run on a mobile device. Instead, it is delivered in the form of a plug-in for Internet Explorer, hence maybe the "preview" in the name. The plug-in run XForms client-side, just like the browser would if it supported XForms natively.
XForms 1.0 提供了一种新的用于联机交互的平台独立标记语言。W3C 已经出现了用于实现 XForms 的规范，而且 XForm 被认为是 HTML 形式的继任者。
XForms 独立于表示设备。无需对传统浏览器、PDA 移动电话、语言浏览器、甚至一些更奇怪的新兴客户机（比如 instant messenger）进行任何更改，就可以传递 XForms。这使得 XForms 成为更吸引 RIA 的工具。
在 XForms 中，实际数据（XML 表单定义）与表单表示分离。这种设备独立的 XML 表单定义叫做 XForms 模型，可以用于许多标准的或专用的用户界面。
XForms 用户界面提供了一组标准的可视控件，旨在于替换当今的 XHTML 表单控件。它们可用于 XHTML SVG 或其他组、语言浏览器组中，还可以独立开发 XForms 的用户界面组件。XForms 模型被引用在每个 XForms 控件中以呈现数据。它遵循 XPath 以引用 XML 中的元素。提交数据时，它只能提交已填充的 XML 数据模型。
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