Pangaea will be a robust and feature filled game engine built using Allegro (http://alleg.sourceforge.net) It will be similar to Final Fantasy 1-3, etc., complete with map editor/world builder.
This project provides customization of XML editors to support publicly availble SGML and XML DTDs in particular those of the MSR-MEDOC project. While starting with XMETAL (aka xmetal) other systems are welcome.