--- /dev/null
+from zope.interface import Interface
+
+class IContentHistory(Interface):
+ """
+ Utility to manage historical entries of a content
+ """
+
+ def listEntries() :
+ """
+ Return historical entries of the content
+ """
+
+ def getHistoricalRevisionByKey(key) :
+ """
+ Return the object revision at state targeted by key.
+ """
+
+ def compare(leftkey, rightkey) :
+ """
+ Return formated comparision of 2 revisions of content
+ """
+
+ def restore(key) :
+ """
+ Restore the content by editing chosen versionned attributes.
+ example: for a Document, only the textual content will be restored.
+ Metadata or talkback stay unchanged.
+ """
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