diff --git a/driver.py b/driver.py
index 8116b68..d9805e1 100755
--- a/driver.py
+++ b/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # Relational
-# Copyright (C) 2010-2017  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2010-2020  Salvo "LtWorf" Tomaselli
 #
 # Relational is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -57,7 +57,7 @@ def load_relations():
 
             print ("Loading relation %s with name %s..." % (i, relname))
 
-            rels[relname] = relation.relation('%s%s' % (examples_path, i))
+            rels[relname] = relation.Relation('%s%s' % (examples_path, i))
             print('done')
 
 
@@ -238,7 +238,7 @@ def run_test(testname):
     o_result = None
 
     try:
-        result_rel = relation.relation('%s%s.result' % (tests_path, testname))
+        result_rel = relation.Relation('%s%s.result' % (tests_path, testname))
 
         query = readfile('%s%s.query' % (tests_path, testname)).strip()
         o_query = optimizer.optimize_all(query, rels)
diff --git a/relational/parser.py b/relational/parser.py
index dd8ef63..af508bd 100644
--- a/relational/parser.py
+++ b/relational/parser.py
@@ -29,6 +29,32 @@ from dataclasses import dataclass
 
 from relational import rtypes
 
+
+__all__ = [
+    'PRODUCT',
+    'DIFFERENCE',
+    'UNION',
+    'INTERSECTION',
+    'DIVISION',
+    'JOIN',
+    'JOIN_LEFT',
+    'JOIN_RIGHT',
+    'JOIN_FULL',
+    'PROJECTION',
+    'SELECTION',
+    'RENAME',
+    'ARROW',
+    'TokenizerException',
+    'ParserException',
+    'CallableString',
+    'Node',
+    'Unary',
+    'Binary',
+    'Variable',
+    'tree',
+    'parse',
+]
+
 PRODUCT = '*'
 DIFFERENCE = '-'
 UNION = '∪'
diff --git a/relational/relation.py b/relational/relation.py
index 84782dd..c6589aa 100644
--- a/relational/relation.py
+++ b/relational/relation.py
@@ -1,5 +1,5 @@
 # Relational
-# Copyright (C) 2008-2018  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2008-2020  Salvo "LtWorf" Tomaselli
 #
 # Relational is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -28,6 +28,12 @@ from pathlib import Path
 from relational.rtypes import *
 
 
+__all__ = [
+    'Relation',
+    'Header',
+]
+
+
 class Relation:
 
     '''
@@ -336,7 +342,7 @@ class Relation:
                     added = True
             # If it didn't partecipate, adds it
             if not added:
-                item = chain(i, repeat(rstring('---'), len(noid)))
+                item = chain(i, repeat(Rstring('---'), len(noid)))
                 newt.content.add(tuple(item))
 
         return newt
@@ -468,7 +474,7 @@ class Relation:
         self._make_writable()
 
         prevlen = len(self.content)
-        self.content.add(tuple(map(rstring, values)))
+        self.content.add(tuple(map(Rstring, values)))
         return len(self.content) - prevlen
 
     def delete(self, expr: str) -> int:
@@ -541,7 +547,3 @@ class Header(tuple):
             return [self.index(i) for i in param]
         except ValueError as e:
             raise Exception('One of the fields is not in the relation: %s' % ','.join(param))
-
-# Backwards compatibility
-relation = Relation
-header = Header
diff --git a/relational/rtypes.py b/relational/rtypes.py
index 001be15..1bc4970 100644
--- a/relational/rtypes.py
+++ b/relational/rtypes.py
@@ -1,5 +1,5 @@
 # Relational
-# Copyright (C) 2008-2017  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2008-2020  Salvo "LtWorf" Tomaselli
 #
 # Relation is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -55,7 +55,7 @@ class Rstring(str):
             elif self.isFloat():
                 self._autocast = float(self)
             elif self.isDate():
-                self._autocast = rdate(self)
+                self._autocast = Rdate(self)
         return self._autocast
 
     def isInt(self) -> bool:
@@ -119,8 +119,8 @@ class Rdate (object):
 
     def __init__(self, date):
         '''date: A string representing a date'''
-        if not isinstance(date, rstring):
-            date = rstring(date)
+        if not isinstance(date, Rstring):
+            date = Rstring(date)
 
         self.intdate = date.getDate()
         self.day = self.intdate.day
@@ -136,7 +136,7 @@ class Rdate (object):
 
     def __add__(self, days):
         res = self.intdate + datetime.timedelta(days)
-        return rdate(res.__str__())
+        return Rdate(res.__str__())
 
     def __eq__(self, other):
         return self.intdate == other.intdate
@@ -164,8 +164,3 @@ def is_valid_relation_name(name: str) -> bool:
     '''Checks if a name is valid for a relation.
     Returns boolean'''
     return re.match(RELATION_NAME_REGEXP, name) != None and not keyword.iskeyword(name)
-
-
-# Backwards compatibility
-rdate = Rdate
-rstring = Rstring
diff --git a/relational_readline/linegui.py b/relational_readline/linegui.py
index fa4caef..872c996 100644
--- a/relational_readline/linegui.py
+++ b/relational_readline/linegui.py
@@ -1,5 +1,5 @@
 # Relational
-# Copyright (C) 2010-2017  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2010-2020  Salvo "LtWorf" Tomaselli
 #
 # Relational is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -137,7 +137,7 @@ def load_relation(filename: str, defname:Optional[str]=None) -> Optional[str]:
             "%s is not a valid relation name" % defname, ERROR_COLOR), file=sys.stderr)
         return None
     try:
-        relations[defname] = relation.relation(filename)
+        relations[defname] = relation.Relation(filename)
 
         completer.add_completion(defname)
         printtty(colorize("Loaded relation %s" % defname, COLOR_GREEN))