What is not UsiXML ?

The coverage of UsiXML in terms of target UIs is large. However, it is not supposed to cover all features of all types of UI. Therefore,

• UsiXML does not want to introduce yet another language for UI implementation. Instead, it proposes the integration of some of these formats: cHTML, WML, HTML, XHTML, VoiceXML, VRML, Java, C++,.... It is up to the underlying implementation to support the transformation of UsiXML into such a format.
• UsiXML does not describe the low-level details of elements involved in the various modalities, such as operating system attributes, events, and primitives.
• UsiXML cannot be rendered nor executed by its own: it relies on an implementation in any third-party rendering engine.
• UsiXML does not want to support all attributes, events, and primitives of all widgets existing in nearly all toolkits. Instead, it is intended to support a common subset of them.