Removing custom property sheet with uninstall profile

admin

This is confusing for at least two reasons:

• We have both "old style" and "new style" technologies actively in use. Old style refers to Extensions/Install.py (Python code) and new style refers to profiles/default (GS XML + setuphandlers.py Python code).
  
• Successfully installing and uninstalling add-ons in all possible cases still requires the use of both old and new style technologies.
  
  

If you don't care about uninstall, you never need to use Extensions/Install.py. If you do care about uninstall, create an Extensions/Install.py with install and uninstall methods. Also create an "uninstall" profile (in addition to the "default" profile) e.g. profiles/uninstall. Configure the Extensions/Install.py:install() method to execute your "normal" profiles/default steps on installation. Now comes the "fun" part.
Because some technologies can be uninstalled "properly" via GS i.e. they respect the remove=True parameter, your Extensions/Install.py:uninstall() method should execute the "proper" GS profiles to do the uninstall. But if your add-on uses technologies that cannot be uninstalled "properly" via GS i.e. those that do not respect the remove=True parameter, then you will need to write Python code to perform the uninstall.
See:

• http://plone.org/documentation/kb/genericsetup/creating-an-uninstall-profile
  

for more information.