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diff --git a/src/mailman/interfaces/requests.py b/src/mailman/interfaces/requests.py
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+# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Interfaces for the request database.
+
+The request database handles events that must be approved by the list
+moderators, such as subscription requests and held messages.
+"""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'IListRequests',
+    'IRequests',
+    'RequestType',
+    ]
+
+
+from munepy import Enum
+from zope.interface import Interface, Attribute
+
+
+
+class RequestType(Enum):
+    held_message = 1
+    subscription = 2
+    unsubscription = 3
+
+
+
+class IListRequests(Interface):
+    """Held requests for a specific mailing list."""
+
+    mailing_list = Attribute(
+        """The IMailingList for these requests.""")
+
+    count = Attribute(
+        """The total number of requests held for the mailing list.""")
+
+    def count_of(request_type):
+        """The total number of requests held of the given request type.
+
+        :param request_type: A `RequestType` enum value.
+        :return: An integer.
+        """
+
+    def hold_request(request_type, key, data=None):
+        """Hold some data for moderator approval.
+
+        :param request_type: A `RequestType` enum value.
+        :param key: The key piece of request data being held.
+        :param data: Additional optional data in the form of a dictionary that
+            is associated with the held request.
+        :return: A unique id for this held request.
+        """
+
+    held_requests = Attribute(
+        """An iterator over the held requests.
+
+        Returned items have two attributes:
+         * `id` is the held request's unique id;
+         * `type` is a `RequestType` enum value.
+        """)
+
+    def of_type(request_type):
+        """An iterator over the held requests of the given type.
+
+        Returned items have two  attributes:
+         * `id` is the held request's unique id;
+         * `type` is a `RequestType` enum value.
+
+         Only items with a matching `type' are returned.
+         """
+
+    def get_request(request_id):
+        """Get the data associated with the request id, or None.
+
+        :param request_id: The unique id for the request.
+        :return: A 2-tuple of the key and data originally held, or None if the
+            `request_id` is not in the database.
+        """
+
+    def delete_request(request_id):
+        """Delete the request associated with the id.
+
+        :param request_id: The unique id for the request.
+        :raises KeyError: If `request_id` is not in the database.
+        """
+
+
+
+class IRequests(Interface):
+    """The requests database."""
+
+    def get_list_requests(mailing_list):
+        """Return the `IListRequests` object for the given mailing list.
+
+        :param mailing_list: An `IMailingList`.
+        :return: An `IListRequests` object for the mailing list.
+        """