ANPA-1312 is a specialized markup format used in the news media business, similar to the IPTC message format. It was produced by the Newspaper Association of America. It is based on ASCII, but has methods of encoding various traditional newspaper characters dating back to the old-fashioned era of typesetting. There are specific metadata fields associated with the format.
While it is a text markup format, it is apparently also used for image metadata; a Photoshop file format document mentions (with regard to Mac files) that "All of the data from Photoshop's File Info dialog is stored in 'ANPA' resource 10000. The data in this resource is stored as an IPTC-NAA record 2."