Thread: Setting the ISBN to N/A
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Old 07-04-2021, 12:57 AM   #2
theducks
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If you had not noticed, When there is a Valid ISBN, the entry box turns Green.
That is because it has calculated the check bit (last character) and gotten a match. (This test belongs to ISBN type identifiers )

Remember: ISBN's belong to a single edition, not a title in general.

Why not add your own identifier?
The format simply has 2 parts
identifier_name a_colon identifier_value
Code:
checked:1
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