[KevinH]

A manifest id is any properly unique string and is not a way to name files. The file name is specified in the href. One way to create a unique id string is to use a file name if that file name is unique and if it does not violate the rules for creating ids. Another way is to use a known unique id string such as those generated by uuid's and making sure they do not begin with a numeric digit.

All of that said, I hate using filenames for id's as it causes confusion (as seen above), they are generally longer than what is needed, and so are uuids based ids as well. I typically use short small unique strings such as "ch1", "ch2", "apdxA" and the like so that they are mnemonic like file names and are easy to remember and short.

Hope this helps,

KevinH