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diff --git a/Mailman/interfaces/mlistid.py b/Mailman/interfaces/mlistid.py
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+++ b/Mailman/interfaces/mlistid.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 mailing list identity."""
+
+from zope.interface import Interface, Attribute
+
+
+
+class IMailingListIdentity(Interface):
+    """The basic identifying information of a mailing list."""
+
+    list_name = Attribute(
+        """The read-only short name of the mailing list.  Note that where a
+        Mailman installation supports multiple domains, this short name may
+        not be unique.  Use the fqdn_listname attribute for a guaranteed
+        unique id for the mailing list.  This short name is always the local
+        part of the posting email address.  For example, if messages are
+        posted to mylist@example.com, then the list_name is 'mylist'.""")
+
+    host_name = Attribute(
+        """The read-only domain name 'hosting' this mailing list.  This is
+        always the domain name part of the posting email address, and it may
+        bear no relationship to the web url used to access this mailing list.
+        For example, if messages are posted to mylist@example.com, then the
+        host_name is 'example.com'.""")
+
+    fqdn_listname = Attribute(
+        """The read-only fully qualified name of the mailing list.  This is
+        the guaranteed unique id for the mailing list, and it is always the
+        address to which messages are posted, e.g. mylist@example.com.  It is
+        always comprised of the list_name + '@' + host_name.""")