Trust is meta attribute to signal the trustworthy of a stream element. Its value is a double between 0 (untrustworthy) and 1 (trustworthy). In case of recovery, the trust attribute can be used to signal that an element is possible affected by a recovery process (e.g. a duplicate because of a rollback recovery. If the trust is defined as meta attribute at the source access and if a system crash occurs and Odysseus gets recovered, operators that change the trust value of elements get installed, depending on the used recovery technique:

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