Wrong IAdding view concept

There are some problems in the PAU regsitration or better
say in the Plugins registration.

Every global registred item (for adding) like:

  <menuItem
      for="zope.app.container.interfaces.IAdding"
      menu="add_component"
      action="utility.ContentComponentDefinition"
      title="Content Component Definition"
      description="A Persistent Content Component Definition"
      permission="zope.ManageServices"
      />

get listed in the PAU Plugins "Add Menu".
This means the "add_component" menu is used.

If we do this we need a constraints in the __setitem__ method
of one interface used in the PAU for make a constraints
what's can be added in the Plugins container.

If we do this we have to make sure taht all items (Plugins)
provide this contraint.

If we don't use a constraint. we have to use a own Adding
view for the Plugins part. This Adding view can be used for 
items to get added to.

a) The use of a __setitem__ constraints makes required that
items have to fit this constraint.

b) The use of a own IAdding (view) implemenetation
is a cleaner way. I think.

btw,
And since I refactored the addMenuItem directive it is 
possible to use addMenutItem instead of menuItem
for exactly this concept.

What sould we use? What's the better way? 

Regards
Roger Ineichen
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