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[Eduardo César <625980@xxxxxxxxxxxxxxxxxx>]

** Project changed: oship => oshippy

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https://bugs.launchpad.net/bugs/625980

Title:
  some issues in VersionedObject and IVersionedObject

Status in Open Source Health Information Platform - Python:
  In Progress

Bug description:
  
  All methods ending in Valid in IVersionedObject are not methods but invariants.


  Almost all its methods are not implemented.


  The invariants below are not enforced:

  version_count_valid: version_count >= 0

  all_version_ids_valid: all_version_ids /= Void and then
  all_version_ids.count = version_count

  all_versions_valid: all_versions /= Void and then all_versions.count =
  version_count

  latest_version_valid: version_count > 0 implies latest_version /= Void


  Maybe it would be interesting to have a representation function for
  this class.