Is IPTC obsolete?
In this post, Hans de Zomers and VangelisM allude to XMP having replaced IPTC. (I just noticed when the thread was revived yesterday.)
Wikipedia says: "The Extensible Metadata Platform (XMP) has largely superseded IIM's image file header structure, but the properties of the IPTC Core are synchronized between the technical structures of XMP and IIM by a vast majority of imaging software." I don't quite understand what that means, but it sounds like they are saying most software is backward compatible with IPTC, and/or copies redundant XMP data into IPTC.
As a configuration option, the new version of GIMP 2.10 allows a choice of metadata to save. If it's true that IPTC is obsolete, I'll uncheck it. Thanks.