Using the TEI means we can integrate all of these in a single well-understood XML framework
<TEI.2> <teiHeader> <fileDesc><titleStmt> <title>A digital edition of AM 1234 Fol.</title></titleStmt> .... <sourceDesc> <msDescription id="AM1234F"> ... </msDescription> </sourceDesc> ... </teiHeader> <text> <body> <!-- transcription --> </body> <back> <!-- page images --> </back> </text> </TEI.2>