diff -r 20ad17c99898 -r e31e81bcf6dd src/pyams_catalog/interfaces/__init__.py
--- a/src/pyams_catalog/interfaces/__init__.py	Wed May 20 12:21:20 2015 +0200
+++ b/src/pyams_catalog/interfaces/__init__.py	Wed Jun 17 09:55:43 2015 +0200
@@ -18,6 +18,7 @@
 # import interfaces
 
 # import packages
+from zope.interface import Interface
 
 
 NLTK_LANGUAGES = {'da': 'danish',
@@ -35,3 +36,16 @@
                   'ru': 'russian',
                   'es': 'spanish',
                   'sv': 'swedish'}
+
+
+NO_RESOLUTION = 6
+SECOND_RESOLUTION = 5
+MINUTE_RESOLUTION = 4
+HOUR_RESOLUTION = 3
+DATE_RESOLUTION = 2
+MONTH_RESOLUTION = 1
+YEAR_RESOLUTION = 0
+
+
+class INoAutoIndex(Interface):
+    """Marker interface for objects which shouldn't be automatically indexed"""