Under coffebreak development by JohnV, this is intended to enable synchronizing pages between different wiki instances. Currently the development is following the lines of:

• SynchronizingPageProvider, SynchronizingAttachmentProvider -- Use either or both depending on what you want to syncronize.
  • Synchronizer - Coordinates the synchonization work, delegates to:
    • OutboundStrategy - Interface to generates and sends synchronization packets
      • EmailOutboundStrategy - Default implementation over email. Syncroniation packets are encrypted file attachments.
    • InboundStrategy - Interface to recieve and consume synchroniation packets
      • EmailInboundStrategy - Default implemenation over email.
      • XmlRpcInboundStrategy - Alternate implemenation, can pull pages from foriegn wiki using XmlRpc.
    • ConflictResolutionStrategy - Interface to a custom means to merge conflicts.
      • AutoMergeStrategy - Try a 3 way merge of wiki-text
      • ConflictingEditPageStrategy - Simply repalce the conflict page with both edits in PRE blocks, much like EditConflict.jsp looks.

Anyway it hooks in as a provider, and the exact means of doing the synchonization is pluggable via 3 key interfaces. This should allow for anything one might want.