--- a/src/pyams_content/component/links/interfaces.py	Wed Sep 25 09:47:48 2019 +0200
+++ b/src/pyams_content/component/links/interfaces.py	Wed Sep 25 09:50:05 2019 +0200
@@ -10,21 +10,18 @@
 # FOR A PARTICULAR PURPOSE.
 #
 
-__docformat__ = 'restructuredtext'
+from zope.interface import Attribute, Interface
+from zope.schema import Bool, Choice, InterfaceField, TextLine, URI
+
+from pyams_content.component.association.interfaces import IAssociationContainerTarget, \
+    IAssociationItem
+from pyams_content.reference.pictograms.interfaces import SELECTED_PICTOGRAM_VOCABULARY
+from pyams_i18n.schema import I18nTextField, I18nTextLineField
+from pyams_sequence.interfaces import IInternalReference
+from pyams_utils.schema import MailAddressField
 
 
-# import standard library
-
-# import interfaces
-from pyams_content.component.association.interfaces import IAssociationContainerTarget, IAssociationItem
-from pyams_content.reference.pictograms.interfaces import SELECTED_PICTOGRAM_VOCABULARY
-from pyams_sequence.interfaces import IInternalReference
-
-# import packages
-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, Bool
+__docformat__ = 'restructuredtext'
 
 from pyams_content import _
 
@@ -37,7 +34,8 @@
                               required=False)
 
     description = I18nTextField(title=_("Description"),
-                                description=_("Link description displayed by front-office template"),
+                                description=_(
+                                    "Link description displayed by front-office template"),
                                 required=False)
 
     pictogram_name = Choice(title=_("Pictogram"),
@@ -55,13 +53,45 @@
     """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)"),
+                               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=False,
                                default=False)
 
 
+#
+# Custom internal link properties support
+# These interfaces are used to be able to add custom properties to an internal link
+# when it's target is of a given content type
+#
+
+class IInternalLinkCustomInfoTarget(Interface):
+    """Internal link target info
+
+    This optional interface can be supported be any content to be able to provide any
+    additional information to link properties
+    """
+
+    internal_link_marker_interface = InterfaceField(title=_("Marker interface provided by links "
+                                                            "directed to contents supporting this "
+                                                            "interface"))
+
+
+class ICustomInternalLinkTarget(Interface):
+    """Base interface for custom internal link target"""
+
+
+class IInternalLinkCustomInfo(Interface):
+    """Base interface for custom link properties"""
+
+    properties_interface = InterfaceField(title=_("Info properties interface"))
+
+    def get_url_params(self):
+        """Get custom params to generate link URL"""
+
+
 class IExternalLink(IBaseLink):
     """External link interface"""