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diff --git a/feedgen/ext/base.py b/feedgen/ext/base.py
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+++ b/feedgen/ext/base.py
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+# -*- coding: utf-8 -*-
+'''
+    feedgen.ext.base
+    ~~~~~~~~~~~~~~~~
+
+    Basic FeedGenerator extension which does nothing but provides all necessary
+    methods.
+
+    :copyright: 2013, Lars Kiesow <lkiesow@uos.de>
+
+    :license: FreeBSD and LGPL, see license.* for more details.
+'''
+
+
+class BaseExtension(object):
+    '''Basic FeedGenerator extension.
+    '''
+    def extend_ns(self):
+        '''Returns a dict that will be used in the namespace map for the feed.
+        '''
+        return dict()
+
+    def extend_rss(self, feed):
+        '''Extend a RSS feed xml structure containing all previously set
+        fields.
+
+        :param feed: The feed xml root element.
+        :returns: The feed root element.
+        '''
+        return feed
+
+    def extend_atom(self, feed):
+        '''Extend an ATOM feed xml structure containing all previously set
+        fields.
+
+        :param feed: The feed xml root element.
+        :returns: The feed root element.
+        '''
+        return feed
+
+
+class BaseEntryExtension(BaseExtension):
+    '''Basic FeedEntry extension.
+    '''