Dear BetterRed,
thanks for your answer.
Yes I am aware of the limits of the plugin. Of course I don't ask it to read the entire document, just to begin searching from the actual first page even if the pdf itself is preset to open at page xxx.
As regards OCR, I think I have been writing that I can COPY and paste ISBNs manually, therefore I believe it is already OCRed in my pdfs.
ADDENDUM
Anyway, in order to get insight of the trouble, I have been working experimentally. I opened the pdf, entered in properties and reset the opening page to 1. However the plugin failed again to recognise the ISBN. Then it must be something other.
I suspected now that the culprit may be the ISBN-10 ISBN-13 that may confuse the plugin parser. Sorry, I am unaware whether this has been discussed in this forum.
Last edited by RotAnal; 10-07-2014 at 06:04 AM.
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