How can I tag that a restaurant doesn't have a website

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1

I think it would be cool to go through all restaurants in a certain radius around me and add a link to the website. It probably wouldn’t be too hard with overpass.
But to do so effectively, I would want to tag all places that don’t have a website, so that I don’t want go through the same places twice, preferably with a check_date (because websites might appear at a later date).

What would be the best way to do this?

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2

One option: Don’t add a website=* (because it doesn’t have one), but add check_date:website=* (because you checked whether it has one).

Makes it clear that the website key is intentionally absent rather than just unmapped.

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3

Thanks, this seems like a good approach.