diff -r a64f48dd5fe4 -r 9ab2b4c74baf web/views/timeline.py
--- a/web/views/timeline.py	Thu May 20 20:47:13 2010 +0200
+++ b/web/views/timeline.py	Thu May 20 20:47:55 2010 +0200
@@ -18,14 +18,13 @@
 """basic support for SIMILE's timline widgets
 
 cf. http://code.google.com/p/simile-widgets/
+"""
 
-"""
 __docformat__ = "restructuredtext en"
 
 from logilab.mtconverter import xml_escape
 
-from cubicweb.interfaces import ICalendarable
-from cubicweb.selectors import implements
+from cubicweb.selectors import adaptable
 from cubicweb.view import EntityView, StartupView
 from cubicweb.web import json
 
@@ -37,11 +36,12 @@
     should be properties of entity classes or subviews)
     """
     __regid__ = 'timeline-json'
+    __select__ = adaptable('ICalendarable')
+
     binary = True
     templatable = False
     content_type = 'application/json'
 
-    __select__ = implements(ICalendarable)
     date_fmt = '%Y/%m/%d'
 
     def call(self):
@@ -74,8 +74,9 @@
         'link': 'http://www.allposters.com/-sp/Portrait-of-Horace-Brodsky-Posters_i1584413_.htm'
         }
         """
-        start = entity.start
-        stop = entity.stop
+        icalendarable = entity.cw_adapt_to('ICalendarable')
+        start = icalendarable.start
+        stop = icalendarable.stop
         start = start or stop
         if start is None and stop is None:
             return None
@@ -116,7 +117,7 @@
     """builds a cubicweb timeline widget node"""
     __regid__ = 'timeline'
     title = _('timeline')
-    __select__ = implements(ICalendarable)
+    __select__ = adaptable('ICalendarable')
     paginable = False
     def call(self, tlunit=None):
         self._cw.html_headers.define_var('Timeline_urlPrefix', self._cw.datadir_url)