While Vex supports common document types such as DocBook and XHTML out-of-the-box, you can also extend Vex with your own DTD files and CSS stylesheets.
The first step to extending Vex is to create a plug-in project. Once this is done, you can copy the DTD and CSS files you wish into the plug-in project. Finally, you must provide a little more information to Vex by setting properties on the new DTD and CSS files. Note that you must provide both a DTD and a CSS file to be able to edit documents of the given type.
