diff -r 000000000000 -r 7c0001cacf8e src/pyams_content/component/extfile/interfaces/__init__.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_content/component/extfile/interfaces/__init__.py	Thu Oct 08 13:37:29 2015 +0200
@@ -0,0 +1,108 @@
+#
+# Copyright (c) 2008-2015 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
+from zope.annotation.interfaces import IAttributeAnnotatable
+from zope.container.interfaces import IContainer
+
+# import packages
+from pyams_i18n.schema import I18nTextLineField, I18nTextField, I18nFileField, I18nThumbnailImageField
+from pyams_utils.schema import PersistentList
+from zope.container.constraints import containers, contains
+from zope.interface import Interface, Attribute
+from zope.schema import TextLine, Choice
+
+from pyams_content import _
+
+
+EXTFILE_CONTAINER_KEY = 'pyams_content.extfile'
+EXTFILE_LINKS_CONTAINER_KEY = 'pyams_content.extfile.links'
+
+
+class IBaseExtFile(IAttributeAnnotatable):
+    """Base external file interface"""
+
+    containers('.IExtFileContainer')
+
+    title = I18nTextLineField(title=_("Title"),
+                              description=_("File title, as shown in front-office"),
+                              required=True)
+
+    description = I18nTextField(title=_("Description"),
+                                description=_("File description displayed by front-office template"),
+                                required=False)
+
+    author = TextLine(title=_("Author"),
+                      description=_("Name of document's author"),
+                      required=False)
+
+
+class IExtFile(IBaseExtFile):
+    """Generic external file interface"""
+
+    data = I18nFileField(title=_("File data"),
+                         description=_("File content"),
+                         required=True)
+
+
+class IExtMedia(IExtFile):
+    """External media file interface"""
+
+
+class IExtImage(IExtMedia):
+    """External image file interface"""
+
+    data = I18nThumbnailImageField(title=_("Image data"),
+                                   description=_("Image content"),
+                                   required=True)
+
+
+class IExtVideo(IExtMedia):
+    """External video file interface"""
+
+
+class IExtAudio(IExtMedia):
+    """External audio file interface"""
+
+
+class IExtFileContainer(IContainer):
+    """External files container"""
+
+    contains(IBaseExtFile)
+
+    files = Attribute("Files list iterator")
+    medias = Attribute("Medias list iterator")
+    images = Attribute("Images list iterator")
+    videos = Attribute("Videos list iterator")
+    audios = Attribute("Audios list iterator")
+
+
+class IExtFileContainerTarget(Interface):
+    """External files container marker interface"""
+
+
+class IExtFileLinksContainer(Interface):
+    """External files links container interface"""
+
+    files = PersistentList(title=_("External files"),
+                           description=_("List of external files linked to this object"),
+                           value_type=Choice(vocabulary="PyAMS content external files"),
+                           required=False)
+
+
+class IExtFileLinksContainerTarget(Interface):
+    """External files links container marker interface"""