gtml is an HTML pre-processor which adds some extra features specially designed for maintaining multiple Web pages. Using gtml you cancreate and use macros to save typing, create a "project file" with the names of all your Web pages to update them all with one command, give specific alias to filename to make it is easy to move files and have links preserved, specify a tree-like hierarchy of Web pages to have Next, Previous and Up links added automatically, include files into all your HTML files, include a timestamp, use conditional commands to create different versions of the output, and generate output to different directories to generate different versions of your site.