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diff --git a/Mailman/TopicMgr.py b/Mailman/TopicMgr.py
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+++ b/Mailman/TopicMgr.py
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+# Copyright (C) 2001,2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+"""This class mixes in topic feature configuration for mailing lists.
+"""
+
+import re
+
+from Mailman import mm_cfg
+from Mailman.i18n import _
+
+
+
+class TopicMgr:
+    def InitVars(self):
+        # Configurable
+        #
+        # `topics' is a list of 4-tuples of the following form:
+        #
+        #     (name, pattern, description, emptyflag)
+        #
+        # name is a required arbitrary string displayed to the user when they
+        # get to select their topics of interest
+        #
+        # pattern is a required verbose regular expression pattern which is
+        # used as IGNORECASE.
+        #
+        # description is an optional description of what this topic is
+        # supposed to match
+        #
+        # emptyflag is a boolean used internally in the admin interface to
+        # signal whether a topic entry is new or not (new ones which do not
+        # have a name or pattern are not saved when the submit button is
+        # pressed).
+        self.topics = []
+        self.topics_enabled = 0
+        self.topics_bodylines_limit = 5
+        # Non-configurable
+        #
+        # This is a mapping between user "names" (i.e. addresses) and
+        # information about which topics that user is interested in.  The
+        # values are a list of topic names that the user is interested in,
+        # which should match the topic names in self.topics above.
+        #
+        # If the user has not selected any topics of interest, then the rule
+        # is that they will get all messages, and they will not have an entry
+        # in this dictionary.
+        self.topics_userinterest = {}