The organization that determines the standards for the World Wide Web is expected to announce Tuesday whether XML (Extensible Markup Language) will become the next Web standard. Related in form and function to HTML, XML allows developers greater control in publishing Web documents. Both languages are related to SGML, which is the original language of the Web. XML retains most of the features associated with SGML and HTML, including vendor independence, user extensibility, complex structures, validation and human readability. Like HTML, XML pulls this off in a way that is much easier to implement and understand. Though no official announcements have been made, XML currently is used to some extent in products like the latest versions of Netscape Navigator and Microsoft Internet Explorer. More than a few other companies have announced product support. Existing commercial tools and a rapidly growing number of free ones already can process XML. Though ballots already have been cast, the final decision for standardization lies in the hands of Time Berners-Lee, the inventor of the World Wide Web and director of the W3. Berners-Lee is expected to make his announcement Tuesday.