diff -r 1fe028e17f70 -r 34e6d07ea2e9 src/pyams_content/shared/blog/interfaces.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_content/shared/blog/interfaces.py	Tue Nov 06 14:40:22 2018 +0100
@@ -0,0 +1,80 @@
+#
+# Copyright (c) 2008-2016 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'
+
+from zope.container.constraints import containers, contains
+from zope.container.interfaces import IContainer
+from zope.interface import Attribute, Interface
+from zope.schema import Text
+
+from pyams_content.shared.common.interfaces import ISharedSite, IBaseSharedTool, ISharedContent, \
+    IDeletableElement, IWfSharedContentPortalContext
+from pyams_i18n.schema import I18nTextField
+from pyams_sequence.interfaces import ISequentialIdTarget
+from pyams_workflow.interfaces import IWorkflowPublicationSupport
+
+from pyams_content import _
+
+
+BLOG_CONTENT_TYPE = 'blog'
+BLOG_CONTENT_NAME = _("Blog post")
+
+
+class IWfBlogPost(IWfSharedContentPortalContext):
+    """Blog topic interface"""
+
+
+class IWfBlogPostFactory(Interface):
+    """Blog post factory interface"""
+
+
+class IBlogPost(ISharedContent, IDeletableElement):
+    """Workflow managed blog post interface"""
+
+    containers('.IBlogFolder')
+
+
+class IBlogFolder(IContainer, IDeletableElement):
+    """Blog folder interface"""
+
+    containers('.IBlogManager', '.IBlogFolder')
+    contains('.IBlogFolder', '.IBlogPost')
+
+
+class IBlogFolderFactory(Interface):
+    """Blog folder factory interface"""
+
+
+class IBlogManager(ISharedSite, IBaseSharedTool, IWorkflowPublicationSupport, IDeletableElement, ISequentialIdTarget):
+    """Blog manager interface"""
+
+    contains(IBlogFolder)
+
+    folder_factory = Attribute("Blog folder factory")
+
+    topic_content_type = Attribute("Topic content type")
+    topic_content_factory = Attribute("Topic content factory")
+
+    description = I18nTextField(title=_("Meta-description"),
+                                description=_("The blog's description is 'hidden' into HTML's page headers; but it "
+                                              "can be seen, for example, in some search engines results as content's "
+                                              "description; if description is empty, content's header will be used."),
+                                required=False)
+
+    notepad = Text(title=_("Notepad"),
+                   description=_("Internal information to be known about this content"),
+                   required=False)
+
+
+class IBlogManagerFactory(Interface):
+    """Blog manager factory interface"""