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The docs for search/advanced (https://api.stackexchange.com/docs/advanced-search) have this to state about the tagged attribute:

"tagged - a semicolon delimited list of tags, of which at least one will be present on all returned questions."

I read that to imply that it's an OR search. However in my testing, it appears to be AND. So for example:

https://api.stackexchange.com/2.3/search/advanced?order=desc&sort=activity&site=stackoverflow&accepted=true&tagged=php;coldfusion

Returns questions marked with both tags - but maybe that's luck. But if I add a third tag:

https://api.stackexchange.com/2.3/search/advanced?order=desc&sort=activity&site=stackoverflow&accepted=true&tagged=php;coldfusion;music

It returns nothing.

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  • I read it as OR too, but it is probably a bug with the documentation rather than that of the API - it does seem like the logic is actually AND indeed...
    – Oleg Valter is with Ukraine
    Sep 15, 2021 at 2:02
  • 1
    oh, seems like someone reported this back in 2013: Parameter tagged in search/advanced seems to use AND instead of `OR. This is likely a bug (as mentioned, likely in the docs, but may very well be that SE thinks everything works as expected)
    – Oleg Valter is with Ukraine
    Sep 15, 2021 at 2:03
  • Is there anything 'formal' I can do to report this as a bug?
    – Raymond Camden
    Sep 15, 2021 at 14:22
  • Well, you can try the main Meta... Staff rarely visits down here as it seems. But I think it's been reported multiple times there too :) Here is a report from this year... And this one from 2016...
    – Oleg Valter is with Ukraine
    Sep 15, 2021 at 14:27
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    So you can definitely join the venerable tradition of this bug being reported every couple of years and then completely ignored by the company :)
    – Oleg Valter is with Ukraine
    Sep 15, 2021 at 14:48

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