--- a/doc/book/en/development/entityclasses/interfaces.rst	Wed Mar 24 10:23:31 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,63 +0,0 @@
-Interfaces
-----------
-
-Same thing as object-oriented programming interfaces.
-
-Definition of an interface is quite trivial. An example from cubicweb
-itself (found in cubicweb/interfaces.py):
-
-.. sourcecode:: python
-
-    class ITree(Interface):
-
-        def parent(self):
-            """returns the parent entity"""
-
-        def children(self):
-            """returns the item's children"""
-
-        def children_rql(self):
-            """XXX returns RQL to get children"""
-
-        def iterchildren(self):
-            """iterates over the item's children"""
-
-        def is_leaf(self):
-            """returns true if this node as no child"""
-
-        def is_root(self):
-            """returns true if this node has no parent"""
-
-        def root(self):
-            """returns the root object"""
-
-
-Declaration of interfaces implemented by a class
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. sourcecode:: python
-
-  from cubicweb.interfaces import ITree
-  from cubicweb.mixins import TreeMixIn
-
-  class MyEntity(TreeMixIn, AnyEntity):
-      __regid__ = 'MyEntity'
-      __implements__ = AnyEntity.__implements__ + ('ITree',)
-
-      tree_attribute = 'filed_under'
-
-The TreeMixIn here provides a default implementation for the
-interface. The tree_attribute class attribute is actually used by this
-implementation to help implement correct behaviour.
-
-Interfaces (and some implementations as mixins) defined in the library
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. automodule:: cubicweb.interfaces
-   :members:
-
-.. automodule:: cubicweb.mixins
-   :members:
-
-
-