--- a/src/pyams_content/component/links/interfaces.py	Thu Dec 13 14:26:46 2018 +0100
+++ b/src/pyams_content/component/links/interfaces.py	Fri Dec 14 09:01:01 2018 +0100
@@ -24,7 +24,7 @@
 from pyams_i18n.schema import I18nTextLineField, I18nTextField
 from pyams_utils.schema import MailAddressField
 from zope.interface import Attribute
-from zope.schema import Choice, TextLine, URI
+from zope.schema import Choice, TextLine, URI, Bool
 
 from pyams_content import _
 
@@ -54,6 +54,13 @@
 class IInternalLink(IBaseLink, IInternalReference):
     """Internal link interface"""
 
+    force_canonical_url = Bool(title=_("Force canonical URL?"),
+                               description=_("By default, internal links use a \"relative\" URL, which tries to "
+                                             "display link target in the current context; by using a canonical URL, "
+                                             "you can display target in it's attachment context (if defined)"),
+                               required=True,
+                               default=False)
+
 
 class IExternalLink(IBaseLink):
     """External link interface"""