[Zope3-dev] Basic Interfaces question

[Jim Washington]

Let's say we have an interface IFoo and an interface IFooExtended

IFoo defines foo as

def foo():
    """do foo"""

IFooExtended defines foo as

def foo(myParam=None)
    """do the same thing as foo in IFoo, except use myParam to extend 
behavior if available"""

should IFooExtended descend from IFoo, or should IFooExtended be a 
different interface?

i.e., should the definition of IFooExtended be

class IFooExtended(IFoo):

or

class IFooExtended(Interface)

or is there something better?

-- Jim Washington
Feeling like a zope novice all over again...