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Originally Posted by jbenny
OK, that makes more sense now. Just different terminology. GregS calls them WUID, the WikiPedia says UUID. I am familiar with the use of a GUID. I didn't know that they were also used in ebooks. This would certainly be another method for those without an ISBN to use.
Hadrien, are you using a UUID for each individual ebook that is generated on your site, or just for each title? If for each individual ebook, why bother?
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JBENNY, it is early days in many ways - but UUIDs are dangerous - they are just big numbers there is no verification that the same number cannot occur in different contexts, just that it is unlikely.
GUID suffer the same problem.
WUIDs, which I might add have been used by Microsoft after an article of mine was published are absolutely unique. Lestec, developed the idea and has it implemented - it requires only a small script to run on servers and relies on two factors - unique IPs followed by a serialised date and number (only one applicant allowed within the time frame).
There is some compression involved and a randomising reversal and it is represented in base32 (the only system where the value remains the same in lower and upper case - there are some refinements base36 +).I would like it standardised, date stamps from a local machine can be added so one "head" can generate endless "tails" - all unique. Please if you want a system of WUIDs contact Lestec - it is simple and guaranteed to work without any chance of duplication - which was my purpose when I wrote the article years ago.
I am not directly associated with Lestec (I cannot program to save my life).
It needs some refinement (reducing the WUID letter size below 22) the server script is trivial however, the conversion routines are not difficult - but it needs to work the same way for everyone to banish any chance of duplication, if you see it as important, please contact Les Moul.