collection recreated in draft-daboo-webdav-sync-01
Still on the topic of precondition failure, the token might become
invalid for reasons other than reaching the history limit of the server.
For example, if a collection is deleted, then recreated, the server
won't necessary maintain sync information about the defunct collection.
Or the server may have encountered a crash causing the history
information to be lost.
Hence, we might want to change the overview section to be more generic:
In some cases a server may no longer be able to honor a previously returned token.
For example, it may only wish to maintain a limited amount of
history about changes to a collection. In that situation it will
return an error to the client when the client presents a token that
is "out of date". At that point the client has to fall back to
synchronizing the entire collection by re-running the report request
using an empty token value.
PS: about the collection recreate scenario, do we want to return a
different precondition ?