diff --git a/cybertools/brain/neuron.py b/cybertools/brain/neuron.py
index d23084b..149fb75 100644
--- a/cybertools/brain/neuron.py
+++ b/cybertools/brain/neuron.py
@@ -1,38 +1,18 @@
-#
-#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
-#
-#  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 of the License, 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
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software
-#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-#
+# cybertools.brain.neuron
 
-"""
-A simple basic implementation of Neuron and Synapsis.
-
-$Id$
+""" A simple basic implementation of Neuron and Synapsis.
 """
 
-from zope.interface import implements
+from zope.interface import implementer
 from cybertools.brain.interfaces import INeuron, ISynapsis
 from cybertools.brain.state import State, Transition
 
 
+@implementer(ISynapsis)
 class Synapsis(object):
     """ A synapsis connects two neurons.
     """
 
-    implements(ISynapsis)
-
     def __init__(self, sender, receiver):
         self.sender = sender
         sender.receivers.append(self)
@@ -46,10 +26,9 @@ class Synapsis(object):
         receiver.notify(session)
 
 
+@implementer(INeuron)
 class Neuron(object):
 
-    implements(INeuron)
-
     def __init__(self):
         self.senders = []
         self.receivers = []
diff --git a/cybertools/brain/session.py b/cybertools/brain/session.py
index 84225d1..f040147 100644
--- a/cybertools/brain/session.py
+++ b/cybertools/brain/session.py
@@ -1,35 +1,15 @@
-#
-#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
-#
-#  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 of the License, 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
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software
-#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-#
+# cybertools.brain.session
 
-"""
-Transaction management.
-
-$Id$
+""" Transaction management.
 """
 
-from zope.interface import implements
+from zope.interface import implementer
 from cybertools.brain.interfaces import ISession
 
 
+implementer(ISession)
 class Session(object):
 
-    implements(ISession)
-
     def __init__(self):
         self.states = {}
 
diff --git a/cybertools/brain/state.py b/cybertools/brain/state.py
index 6caba5c..a4bf706 100644
--- a/cybertools/brain/state.py
+++ b/cybertools/brain/state.py
@@ -1,37 +1,17 @@
-#
-#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
-#
-#  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 of the License, 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
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software
-#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-#
+# cybertools.brain.state
 
-"""
-Base classes for state and state manipulations using a float-based state.
-
-$Id$
+""" Base classes for state and state manipulations using a float-based state.
 """
 
-from zope.interface import implements
+from zope.interface import implementer
 from cybertools.brain.interfaces import IState, ITransition
 
 
+@implementer(IState)
 class State(object):
     """ The state of a neuron.
     """
 
-    implements(IState)
-
     def __init__(self, value=0.0):
         self.value = value
 
@@ -39,10 +19,9 @@ class State(object):
         return '<State %0.1f>' % self.value
 
 
+@implementer(ITransition)
 class Transition(object):
 
-    implements(ITransition)
-
     def __init__(self, synapsis, factor=1.0):
         self.synapsis = synapsis
         self.factor = factor
diff --git a/cybertools/text/README.txt b/cybertools/text/README.txt
index f1f4093..026da2b 100644
--- a/cybertools/text/README.txt
+++ b/cybertools/text/README.txt
@@ -2,8 +2,6 @@
 Text Transformations, e.g. for Full-text Indexing
 =================================================
 
-  ($Id$)
-
 If a converter program needed is not available we want to put a warning
 into Zope's server log; in order to be able to test this we register
 a log handler for testing:
diff --git a/cybertools/text/tests.py b/cybertools/text/tests.py
index f96a338..79aa0b6 100755
--- a/cybertools/text/tests.py
+++ b/cybertools/text/tests.py
@@ -5,21 +5,22 @@ Tests for the 'cybertools.text' package.
 """
 import sys
 #sys.path = [p for p in sys.path if p != '']
-sys.path = sys.path[2:]
-print(sys.path)
+sys.path = sys.path[2:] # avoid import cycle with bs4 when importing html
+#print(sys.path)
 
 import unittest, doctest
 import warnings
 from cybertools.text import pdf
 from cybertools.text.html import htmlToText
 
-warnings.filterwarnings('ignore', category=ResourceWarning)
 
 
 class Test(unittest.TestCase):
     "Basic tests for the text package."
 
     def testBasicStuff(self):
+        warnings.filterwarnings('ignore', category=ResourceWarning)
+        warnings.filterwarnings('ignore', category=DeprecationWarning)
         pass