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diff --git a/Mailman/interfaces/pipeline.py b/Mailman/interfaces/pipeline.py
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+# Copyright (C) 2008 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 describing pipelines."""
+
+from zope.interface import Interface, Attribute
+
+
+
+class IPipeline(Interface):
+    """A pipeline of handlers."""
+
+    name = Attribute('Pipeline name; must be unique.')
+    description = Attribute('A brief description of this pipeline.')
+
+    def __iter__():
+        """Iterate over all the handlers in this pipeline."""
+