The URL for the persistence policy concerning the digital resource and its metadata.
Rationale: It remains an unsolved problem to make all digital resources ever created available for all of time. Either by design or by accident, digital resources may become lost or inaccessible. Given that any digital resource may have been used and are referenced by others, it is extremely important that auditors have, in the very least, access to the metadata in order to best understand their nature and their provenance. Therefore, metadata should persist even when the relevant data are not available. To satisfy this metric, a web-accessible document describes how resources and their metadata will persist in the longest time possible.