Use also "keywords" and "caption" IPTC tags
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geotag
It would be nice if the country, location, city names were added also to the "keywords" and (stringified into one string) into "caption" (both these fields are recognized tags in the IPTC format). The reason is that some image viewers can search images by keywords (such as Picassa) but not by other IPTC tags. The caption tag is, for example, used by jAlbum to show an image label.