What propelled browser-based clients to their popularity, however, was not just the ubiquity of the browser, but the simplicity of HTML, and the ease with which HTML content can be generated dynamically.

A specialized user interface markup language that can be used to manifest graphical user interfaces based on JFC can help developers overcome many of the limitations of existing browser technology, while still retaining its advantages.

More importantly, it can make JFC accessible to a large constituency of web developers, who would not otherwise venture beyond HTML. For a better use experience, it is critical that developers who build web user interfaces understand that there is more to presentation than what HTML delivers.

Now that developers have already started redesigning and reimplementing their presentation code to take advantage of recent advances in XML and XSL, a markup language dedicated to user interfaces presents a huge opportunity to elevate the user experience on the Web.

Such is the potential of XML that, next to a web browser, a high performance XML parser is destined to become a standard fixture on most computing devices, either as part of the web browser itself, or stand-alone.

If XML parsers become as ubiquitous as web browsers, and if large or complex blocks of code can be consolidated behind flexible and easy-to-use XML vocabularies, then software can be developed and deployed rapidly and inexpensively. Advances in XML schema description languages and in parser efficiency make this approach viable.