Actually, I would try to simplify things a little more:
* "${package_name}-${addon/extension/mod/plugin_name}" (considering only the scripts and executables)
* "${package_name}-${addon/extension/mod/plugin_name}-(graphics|models|musics|sunds)" (for non-functional data related to the above)
* And of course, the corresponding "-dev", "-doc", "-engine", "-help" (that is available for viewing through the "Help" menu of a program), "-locale", "-src", both for "${package_name}" and for the previous three items above.
