The logo tag would link to a Logo of a company/organization/shop. To avoid unreliable links, questionable licenses, and the rest of the drawbacks of the "image"[1] tag, the value must link to a Wikimedia Commons image. The value format is identical to the wikimedia_commons[2] format.
[1] https://wiki.openstreetmap.org/wiki/Key:image [2] https://wiki.openstreetmap.org/wiki/Key:wikimedia_commons _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
