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System should scans for damaged/defaced data and metadata using some validation process.
All content being added or incorporated into the DataONE infrastructure has checksums computed, providing a unique signature specific to the particular sequence of bytes present in that object. Any change to the object will result in a different checksum being calculated for that object.
It would be prohibitive to continually compute checksums for all content contained in the system. Therefore, the system should have provision for periodic, random checks that compute the checksum for objects and compare with the original.
The system should automatically replace content determined to be incorrect, and system content managers should be notified of such events. Alternatively, bad content could be queued for processing, which is semi-automatically processed by the data managers.
Content quality checking service
Content present in DataONE
Checksums for all content computed and preserved
Mechanisms available for spot checks of checksum for any object held at any location in the system
Bad content is discovered by failing checksum comparison.
Bad content present in the system has been replaced with known correct objects
Data managers are notified
Data owners may be notified
Figure 1. Interactions for use case 25, System validates metadata and data