Hi all, According to the METS schema, the USE attribute is " A tagging attribute to indicate the intended use of files within this file group (e.g., master, reference, thumbnails for image files)." I'm using the mets:fileSec to capture images of a coin within a larger numismatic XML schema. The @USE is an unrestricted xs:string, and this example document - http://fedora.library.northwestern.edu/fedora/get/inu:inu-afrmap-4333843/source- uses "recto" as a USE for images of a map. By this same token, is it semantically acceptable to have "obverse" and "reverse" as a USE? Example: fileGrp use="obverse" file use="master" file use="reference" file use="thumbnail" fileGrp use="reverse" file use="master" file use="reference" file use="thumbnail" Thanks, Ethan