AXR stands for Arbitrary XML Rendering. Its aim is to provide a better alternative to HTML+CSS. It uses XML for the content and HSS for the design and simple behavior of the interface. HSS is a language based on CSS, but offers many more advanced features, such as object orientation, rule nesting, expressions, references to other objects, modularization (code reuse), etc.It's still in its infancy, being mostly about getting a spec out. There is a prototype, but I dislike its license: GPL. This will kill adoption by commercial browsers.
Also, it would be nice if this was set up as a library for use in many different kinds of applications; not just browsers. Something like this would be really cool for creating rich content applications.
Anyway, go take a look, and tell me what you think.