The system should have a way to add "notes" about the data. This could include specific things that should be watched for (for example, the assumptions that the data was collected under, or the methology used to collect it)...it's not much use to use the dataset "tax data for 1999" in a mission critical application if the methology was to "ask 10 people what the tax rate was in 1999"
Likewise, there should be ways for the public to add notes about possible problems they have found with the data and a feedback mechanism to ensure that others known about these possible problems...for example "21 Main St." no longer exists and should be removed from the "current address" dataset.
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