diff --git a/config/base.py b/config/base.py
index 69d06a1..69f5b2a 100644
--- a/config/base.py
+++ b/config/base.py
@@ -1,5 +1,5 @@
 #
-#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
+#  Copyright (c) 2016 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
@@ -18,8 +18,6 @@
 
 """
 Adapters and others classes for analyzing resources.
-
-$Id$
 """
 
 import os
@@ -33,6 +31,7 @@ from cybertools.meta.config import GlobalOptions as BaseGlobalOptions
 from cybertools.meta.interfaces import IOptions
 from cybertools.meta.namespace import Executor, ExecutionError
 from cybertools.typology.interfaces import IType
+from loops.common import AdapterBase
 from loops.interfaces import ILoops, ILoopsObject, ITypeConcept, IPredicate
 #from loops.query import IQueryConcept
 from loops.expert.concept import IQueryConcept
@@ -73,8 +72,8 @@ class LoopsOptions(Options):
 
     def parseContextOptions(self):
         def result():
-            options = getattr(self.context, 'options', [])
-            for opt in  options:
+            options = getattr(self.context, 'options', None) or []
+            for opt in options:
                 parts = opt.split(':', 1)
                 key = parts[0].strip()
                 if len(parts) == 1:
@@ -128,6 +127,11 @@ class PredicateOptions(LoopsOptions):
     adapts(IPredicate)
 
 
+class ConceptAdapterOptions(LoopsOptions):
+
+    adapts(AdapterBase)
+
+
 class DummyOptions(Options):
 
     def __getitem__(self, key):
diff --git a/config/configure.zcml b/config/configure.zcml
index 0218ca4..cec2980 100644
--- a/config/configure.zcml
+++ b/config/configure.zcml
@@ -27,6 +27,11 @@
     <allow interface="cybertools.meta.interfaces.IOptions" />
   </zope:class>
 
+  <zope:adapter factory="loops.config.base.ConceptAdapterOptions" trusted="True" />
+  <zope:class class="loops.config.base.ConceptAdapterOptions">
+    <allow interface="cybertools.meta.interfaces.IOptions" />
+  </zope:class>
+
   <!-- backward compatibility -->
   <zope:adapter factory="loops.config.base.QueryOptions" trusted="True"
                 for="loops.query.IQueryConcept" />
diff --git a/table.py b/table.py
index ece56e0..2027af8 100644
--- a/table.py
+++ b/table.py
@@ -142,5 +142,8 @@ class DataTableSourceList(object):
                     for k, v in self.context.data.items()]
         return iter(sorted(items, key=lambda x: x[1]))
 
+    def __contains__(self, value):
+        return value in self.context.data
+
     def __len__(self):
         return len(self.context.data)