Often when fixing something, something else gets broken as a result. Updating a website can involve making many changes across multiple objects, and until all of those changes are done, parts of the site might not function properly. The Version object create a private environment to work in where changes are not seen by other users until specified. This allows for a Zope site to be modified in Zope itself without having to take the site off-line or breaking links and object references.
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