--- a/.hgtags	Mon Jun 11 09:59:25 2018 +0200
+++ b/.hgtags	Mon Jun 11 16:13:37 2018 +0200
@@ -15,3 +15,4 @@
 417296f4bfab831c918720a17737e30cda2bd933 0.1.12
 aedd98145b972474f1d68a6fa87653faaf4f7ea3 0.1.13
 f7e43a680f4221fc00ca3c8ed779e772a46961d1 0.1.14
+0b5f84d9eff4d94ae88078b157148fbda6aa7a58 0.1.15

--- a/docs/HISTORY.txt	Mon Jun 11 09:59:25 2018 +0200
+++ b/docs/HISTORY.txt	Mon Jun 11 16:13:37 2018 +0200
@@ -1,6 +1,13 @@
 Changelog
 =========
 
+0.1.15
+------
+ - added "inherit_from" attribute to IInheritInfo interface
+ - added helper to get a persistent adapter through context's annotations
+ - added "canonical_url" function, interface and TALES extension
+ - updated custom PyAMS traverser to notify BeforeTraverseEvent on last traversed object
+
 0.1.14
 ------
  - updated request_property decorator cache key

--- a/src/pyams_utils.egg-info/PKG-INFO	Mon Jun 11 09:59:25 2018 +0200
+++ b/src/pyams_utils.egg-info/PKG-INFO	Mon Jun 11 16:13:37 2018 +0200
@@ -1,6 +1,6 @@
 Metadata-Version: 1.1
 Name: pyams-utils
-Version: 0.1.14
+Version: 0.1.15
 Summary: Utility functions and classes for PyAMS
 Home-page: http://www.ztfy.org
 Author: Thierry Florac
@@ -48,6 +48,13 @@
         Changelog
         =========
         
+        0.1.15
+        ------
+         - added "inherit_from" attribute to IInheritInfo interface
+         - added helper to get a persistent adapter through context's annotations
+         - added "canonical_url" function, interface and TALES extension
+         - updated custom PyAMS traverser to notify BeforeTraverseEvent on last traversed object
+        
         0.1.14
         ------
          - updated request_property decorator cache key

--- a/src/pyams_utils.egg-info/SOURCES.txt	Mon Jun 11 09:59:25 2018 +0200
+++ b/src/pyams_utils.egg-info/SOURCES.txt	Mon Jun 11 16:13:37 2018 +0200
@@ -14,6 +14,7 @@
 src/pyams_utils/decorator.py
 src/pyams_utils/dict.py
 src/pyams_utils/encoding.py
+src/pyams_utils/factory.py
 src/pyams_utils/fanstatic.py
 src/pyams_utils/html.py
 src/pyams_utils/i18n.py
@@ -61,6 +62,7 @@
 src/pyams_utils/interfaces/timezone.py
 src/pyams_utils/interfaces/traversing.py
 src/pyams_utils/interfaces/tree.py
+src/pyams_utils/interfaces/url.py
 src/pyams_utils/interfaces/zeo.py
 src/pyams_utils/locales/pyams_utils.pot
 src/pyams_utils/locales/fr/LC_MESSAGES/pyams_utils.mo
@@ -77,9 +79,4 @@
 src/pyams_utils/timezone/utility.py
 src/pyams_utils/timezone/vocabulary.py
 src/pyams_utils/widget/__init__.py
-src/pyams_utils/widget/decimal.py
-src/pyams_utils/zmi/__init__.py
-src/pyams_utils/zmi/intids.py
-src/pyams_utils/zmi/timezone.py
-src/pyams_utils/zmi/zeo.py
-src/pyams_utils/zmi/templates/connection-test.pt
\ No newline at end of file
+src/pyams_utils/widget/decimal.py
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_utils/interfaces/url.py	Mon Jun 11 16:13:37 2018 +0200
@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2008-2018 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+
+# import standard library
+
+# import interfaces
+
+# import packages
+from zope.interface import Interface, Attribute
+
+
+class ICanonicalURL(Interface):
+    """Interface used to get content's canonical URL"""
+
+    def get_url(self, view_name=None, query=None):
+        """Get content's canonical URL"""

--- a/src/pyams_utils/url.py	Mon Jun 11 09:59:25 2018 +0200
+++ b/src/pyams_utils/url.py	Mon Jun 11 16:13:37 2018 +0200
@@ -17,6 +17,7 @@
 
 # import interfaces
 from pyams_utils.interfaces.tales import ITALESExtension
+from pyams_utils.interfaces.url import ICanonicalURL
 
 # import packages
 from pyams_utils.adapter import ContextRequestViewAdapter, adapter_config
@@ -85,3 +86,33 @@
         if context is None:
             context = self.context
         return absolute_url(context, self.request, view_name)
+
+
+def canonical_url(context, request, view_name=None, query=None):
+    """Get resource canonical URL"""
+
+    # if we pass a string to canonical_url(), argument is returned as-is!
+    if isinstance(context, str):
+        return context
+
+    url_adapter = request.registry.queryMultiAdapter((context, request), ICanonicalURL)
+    if url_adapter is None:
+        url_adapter = request.registry.queryAdapter(context, ICanonicalURL)
+
+    if url_adapter is not None:
+        return url_adapter.get_url(view_name, query)
+    else:
+        return absolute_url(context, request, view_name, query)
+
+
+@adapter_config(name='canonical_url', context=(Interface, Interface, Interface), provides=ITALESExtension)
+class CanonicalUrlTalesExtension(ContextRequestViewAdapter):
+    """extension:canonical_url(context, view_name) TALES extension
+
+    A PyAMS TALES extension used to get access to an object's canonical URL from a page template.
+    """
+
+    def render(self, context=None, view_name=None):
+        if context is None:
+            context = self.context
+        return canonical_url(context, self.request, view_name)