@PeterT: Thanks! At least I now have 500 UUID's to hold me over!
@Diap: I was thinking a random ID... but the idea is to keep them unique. The link Peter posted uses a time stamp combined with a code based on his network gear?? I would think something along these lines would be very simple to incorporate into Sigil - a button in the metadata editor or something - especially since it already has the functionality to generate the code - we just need to tell it to do it.
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