diff --git a/lib/pyulib/src/ulib/base/uio.py b/lib/pyulib/src/ulib/base/uio.py
index 41c6f0f..d48ead0 100644
--- a/lib/pyulib/src/ulib/base/uio.py
+++ b/lib/pyulib/src/ulib/base/uio.py
@@ -7,8 +7,11 @@ import i_need_py23
 __all__ = ('UnicodeIO',
            'EditorIO', 'Utf8IO', 'Latin1IO', 'Latin9IO',
            'defaultIO', '_u', '_s', 'uinput', 'uprint',
+           '_son', '_uon',
+           'latin1compat',
            )
 
+import re
 from sys import stdout, stderr
 from types import StringType, UnicodeType, StringTypes
 
@@ -98,3 +101,30 @@ def _u(u, encoding=None, errors=None): return defaultIO.u(u, encoding, errors)
 def _s(s, encoding=None): return defaultIO.s(s, encoding)
 def uinput(errors='ignore', encoding=None): return defaultIO.uinput(errors, encoding)
 def uprint(s, nl=True, flush=None, encoding=None, out=None): defaultIO.uprint(s, nl, flush, encoding, out)
+
+def _son(s, encoding=None):
+    if s is None: return None
+    else: return _s(s, encoding)
+def _uon(u, encoding=None, errors=None):
+    if u is None: return None
+    else: return _u(u, encoding, errors)
+
+RE_SQUOTE = re.compile(ur'[‘’]')
+RE_DQUOTE = re.compile(ur'[«»“”]')
+RE_SPACE = re.compile(r'[\xC2\xA0\xE2\x80\x87\xE2\x80\xAF\xE2\x81\xA0]'.decode('utf-8'))
+RE_LOE = re.compile(ur'[œ]')
+RE_UOE = re.compile(ur'[Œ]')
+RE_LAE = re.compile(ur'[æ]')
+RE_UAE = re.compile(ur'[Æ]')
+def latin1compat(u):
+    """Remplacer dans la chaine u des caractères unicode par des équivalents qui
+    peuvent être transformés en latin1.
+    """
+    u = RE_SQUOTE.sub("'", u)
+    u = RE_DQUOTE.sub('"', u)
+    u = RE_SPACE.sub(' ', u)
+    u = RE_LOE.sub('oe', u)
+    u = RE_UOE.sub('OE', u)
+    u = RE_LAE.sub('ae', u)
+    u = RE_UAE.sub('AE', u)
+    return u