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diff --git a/src/mailman/interfaces/membership.py b/src/mailman/interfaces/membership.py
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+++ b/src/mailman/interfaces/membership.py
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+# Copyright (C) 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/>.
+
+"""Membership interface for REST."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'SubscriptionService',
+    ]
+
+
+from lazr.restful.declarations import (
+    collection_default_content, export_as_webservice_collection,
+    export_factory_operation)
+from zope.interface import Interface
+
+from mailman.core.i18n import _
+from mailman.interfaces.member import IMember
+
+
+
+class ISubscriptionService(Interface):
+    """Subscription services for the REST API."""
+
+    export_as_webservice_collection(IMember)
+
+    @collection_default_content()
+    def get_members():
+        """Return a sequence of all members of all mailing lists.
+
+        The members are sorted first by fully-qualified mailing list name,
+        then by subscribed email address, then by role.  Because the user may
+        be a member of the list under multiple roles (e.g. as an owner and as
+        a digest member), the member can appear multiple times in this list.
+        Roles are sorted by: owner, moderator, member.
+
+        :return: The list of all members.
+        :rtype: list of `IMember`
+        """