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Made research for ISBN-Number and got quick result from Wikipedia: Presentation with or without additional "-" inside is ok, but for electronic operation it is ok to remove the "-" I assume in the following that all "-" are removed ISBN-10 (old fashioned version until 2007) Take the leftmost 9 digits, digit 10 is checksum from the left count the position from 1 to 10 Sum up z1 * 1 + z2 * 2 + z3 *3 .... + z9 * 9 get modulo 11 from sum that is digit 10 to check against if the rest is 10 then digit 10 is represented by X ISBN-13 (for all books newer than 2007) (this is now identical with EAN-13 for the book) Take the leftmost 12 digits, digit 13 is checksum sum up z1 + z3 + z5 ... + z11 sum up z2 + z4 + z6 ... +z12 and multiply by 3 sum up sum_odd + sum_even*3 get m1 = modulo 10 from sum get m2 modulo 10 from ( 10 - m1 ) m2 is the digit 13 for checking Conversion of ISBN-13 to ISBN-10 - remove the leftmost 3 digits - remove the rightmost checksum digit - calculate the new checksum digit by the rules for ISBN-10 The last steps are important, because amazon.de can not find a book by ISBN-13 (using the extreem-books scrips), even if the ISBN-13 is correctly read out of the epub-file. It would be good to add an option to force the conversion to ISBN-10 regulary, if it is needed for thee used data-source, but to turn it off later, if the data source has learned to use it. In the later future it will be ok to use ISBN-13 mostly. I did not check the theory on examples... sorry, I jusst believed Wikipedia... happy new year michael
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