[Zope3-Users] IContentType: interface implements another interface ?

[Sakesun Roykiattisak]

 From zope/app/content/interfaces:

class IContentType(IInterface):
    """This interface represents a content type.

    If an **interface** implements this interface type, then all object
    implementing the interface are considered content objects.
    """

How can an interface implements IContentType ? (or whatever interface)
Isn't the term "provides" should be used rather than "implements" ?