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diff --git a/Mailman/interfaces/rosterset.py b/Mailman/interfaces/rosterset.py
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+++ b/Mailman/interfaces/rosterset.py
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+# Copyright (C) 2007 by the Free Software Foundation, Inc.
+#
+# This program 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 2
+# of the License, or (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+# USA.
+
+"""Interface for a collection of rosters."""
+
+from zope.interface import Interface, Attribute
+
+
+
+class IRosterSet(Interface):
+    """A collection of IRosters."""
+
+    serial = Attribute(
+        """The unique integer serial number for this roster set.
+
+        This is necessary to enforce the separation between the list storage
+        and the user/roster storage.  You should always reference a roster set
+        indirectly through its serial number.""")
+
+    rosters = Attribute(
+        """An iterator over all the IRosters in this collection.""")
+
+    def add(roster):
+        """Add the IRoster to this collection.
+
+        Does nothing if the roster is already a member of this collection.
+        """
+
+    def delete(roster):
+        """Delete the IRoster from this collection.
+
+        Does nothing if the roster is not a member of this collection.
+        """