Xdoc is a project to rewrite the implementation of the LaTeX doc package (in a broader sense) to make its features more general and flexible. For example, where doc only provides commands for documenting macros and environments, xdoc also provides commands for similarly documenting package options and switches. This is furthermore done in such a way that it is very easy to add more such commands for documenting things, such as e.g., templates, and program components for other languages (functions, classes, procedures, etc.).