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					Originally Posted by uiuiii  Thanks for the pluggin, in general, it's great. However, I got an error: 
 I got a few PDF ebooks (from the same publisher) with the same ISBN extracted ....from a fax number, i.e:
 
 Tel: +...
 Fax: +... (0)1279 431059   ---> this is extracted as a ISBN number
 
 The line of ISBN is a bit later, preceeding with ISBN ....
 
 I wonder how the pluggin analyses the line, would it be a bug, as it should search for the keyword ISBN first (?)
 
 Suggestion:
 - Would it be possible to give an option, checking against online metadata bases with title/author/publisher... as inputs to make sure the extracted number is correct?
 - When more than one ISBN are found, would it be possible to display and let the user choosing one?
 - The field ISBN in Calibre can contain only one value, I wonder how to support more than one value, i.e ISBN-10, ISBN-13..
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 it's not a bug, some books stores information in a different way, which means that what you see isnt exactly stored in the order you see it, for example : 
inside the book it could be stored like : ISBN (101)-101010100 FAX  1234567890908X
but when you see it u see like:
ISBN 1234567890908X
FAX (101)-101010100
in this case text search for isbn might fail despite of the search algorithm, you will need ocr search utility.