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diff --git a/trunk/psycopg2/lib/extensions.py b/trunk/psycopg2/lib/extensions.py
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+"""psycopg extensions to the DBAPI-2.0
+
+This module holds all the extensions to the DBAPI-2.0 provided by psycopg.
+
+- `connection` -- the new-type inheritable connection class
+- `cursor` -- the new-type inheritable cursor class
+- `adapt()` -- exposes the PEP-246_ compatible adapting mechanism used
+  by psycopg to adapt Python types to PostgreSQL ones
+  
+.. _PEP-246: http://www.python.org/peps/pep-0246.html
+"""
+# psycopg/extensions.py - DBAPI-2.0 extensions specific to psycopg
+#
+# Copyright (C) 2003-2004 Federico Di Gregorio  <fog@debian.org>
+#
+# 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, 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 MERCHANTIBILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+
+from _psycopg import UNICODE, INTEGER, LONGINTEGER, BOOLEAN, FLOAT
+from _psycopg import TIME, DATE, INTERVAL
+
+from _psycopg import Boolean, QuotedString, AsIs
+try:
+    from _psycopg import DateFromMx, TimeFromMx, TimestampFromMx
+    from _psycopg import IntervalFromMx
+except:
+    pass
+try:
+    from _psycopg import DateFromPy, TimeFromPy, TimestampFromPy
+    from _psycopg import IntervalFromPy
+except:
+    pass
+
+from _psycopg import adapt, adapters, encodings, connection, cursor
+from _psycopg import string_types, binary_types, new_type, register_type
+from _psycopg import ISQLQuote
+
+"""Isolation level values."""
+ISOLATION_LEVEL_AUTOCOMMIT     = 0
+ISOLATION_LEVEL_READ_COMMITTED = 1 
+ISOLATION_LEVEL_SERIALIZABLE   = 2
+
+# PostgreSQL maps the the other standard values to already defined levels
+ISOLATION_LEVEL_REPEATABLE_READ  = ISOLATION_LEVEL_SERIALIZABLE
+ISOLATION_LEVEL_READ_UNCOMMITTED = ISOLATION_LEVEL_READ_COMMITTED
+
+"""Transaction status values."""
+STATUS_SETUP = 0
+STATUS_READY    = 1
+STATUS_BEGIN    = 2
+STATUS_SYNC     = 3
+STATUS_ASYNC    = 4
+
+# This is a usefull mnemonic to check if the connection is in a transaction
+STATUS_IN_TRANSACTION = STATUS_BEGIN
+
+
+def register_adapter(typ, callable):
+    """Register 'callable' as an ISQLQuote adapter for type 'typ'."""
+    adapters[(typ, ISQLQuote)] = callable
+
+__all__ = [ k for k in locals().keys() if not k.startswith('_') ]