pt:
---

<ul>
  <li tal:repeat="menu_item options/viewlets">
    <span tal:replace="menu_item/menuItems" /> 
<!-- really, the above line should be the link and everything... this is a toy -->
  </li>
</ul>

viewlet python:
---------------

class Navigation(ViewletBase):
    def menuItems(self):
        return MenuItem('Project Preferences', 'base_edit')