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diff --git a/src/sexparse/base.py b/src/sexparse/base.py
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+++ b/src/sexparse/base.py
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+#Copyright (c) 2014, Joseph Hunkeler <jhunkeler at gmail.com>
+#All rights reserved.
+#
+#Redistribution and use in source and binary forms, with or without
+#modification, are permitted provided that the following conditions are met:
+#
+#1. Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer. 
+#2. Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+#
+#THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+#ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+#WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+#DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+#ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+#(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+#LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+#ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+#SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+import os
+from collections import OrderedDict
+
+__all__ = ['SexConfigBase']
+
+class SexConfigBase(object):
+    def __init__(self, filename):
+        self.filename = os.path.abspath(filename)
+        self.pairs = OrderedDict()
+        self.comment = '#'
+    
+    def diff(self, obj):
+        if self.pairs != obj.pairs:
+            return True
+        return False            
+    
+    def read(self):
+        pass
+    
+    def write(self, filename=None):
+        pass
+    
+    def __getitem__(self, key):
+        return self.pairs[key]
+    
+    def __setitem__(self, key, item):
+        self.pairs[key] = item
+    
+    def __iter__(self):
+        return self.pairs.iteritems()