The eXportable object for a page defines its accessibility and visibility. Note how:
- Some pages require sign in. They still appear in menu for anonymous users.
- Some pages are linked in menu only for anonymous users.
- Pages that require admin are only included in the menu for an admin user.
- Contextual menu generation also happens for diverted pages, e.g. login and error pages.
- An application may declare arbitrary permissions and associate them with any user and object.
The python source for the SiteDirectory's exportables offers a good example of this mechanism.
Visual feedback on login status (see this site's main CSS and gz.skin.render.dhi_page()):
- anonymous
- normal signed in user
- admin user