On Fri, 12 Feb 2010, Oliver Kuehn (skobbler) wrote:
> Another helpful feature could be an "expiry date". Each import can not be
> valid longer than e.g. 12 months. After this period the dataset needs
>  update and receives a new validity data. Otherwise the data will become
>  inactive.
> 
natural features don't go out of date that fast.

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