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Metadata Issues in Digital Library

At this point in time, the primary image metadata schema has been "File Info" which is non-image data embedded within Photoshop image files. Originally employed by the newspaper industry, IPTC (International Press and Telecommunications Council) metadata contains only a few fields of limited text used to help organize and distribute photographic images for newspaper publishing. “File Info” which is the Photoshop implementation of the IPTC specification plus additional data fields, defines both the storage format as well as the actual metadata.

It's a good start if you're looking to resolve metadata issues in a digital photo library.