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Emacs is easily one of the most powerful (if not the most powerful) text editors in the world. It has an internal Lisp programming language, which means that it can be easily extended, and as a consequence Emacs has suppot for most programming languages ever invented, as well as a web browser with CSS support and a world-class news and mail reader.
The user interface is quite unlike most modern editors, but Emacs comes with internal documentation which can help you out.
This is an old SGML mode which has been patched to support XML. It reads the DTD, can use an external parser to validate documents, does syntax colouring as well as help you insert only the correct elements at your current location.