\usepackage
declarations. For every such declaration it tries to find an extension
that defines the LaTeX macros from that package. These extensions are
Emacs lisp files residing in either a system-wide Hyperlatex extension
directory (set up by the person who installed Hyperlatex), or in your
personal directory .hyperlatex in your home directory.
Currently, Hyperlatex is distributed with only one extension file, for
the package longtable (and even that is minimal, just to show how
to write an extension file). Support for other packages will be added
when users need it and cannot create the extension files themselves.
To write a general Hyperlatex extension file, you would have to
program in Emacs lisp. In many cases, however, it is sufficient to
define a number of commands in terms of the basic Hyperlatex commands
(just like \newcommand or \newenvironment do). This can be done
quite easily, and you can create you own extension files on the model
of the file hlx-longtable.el provided with hyperlatex.
(Note that Hyperlatex looks for support for the package package in
a file hlx-package.el. That file should bind the function
hyperlatex-package-hook.)
If you write a support file for one of the standard LaTeX packages, please share it with us.