I need to develop EAN-13 barcode support in next two weeks to migrate one university library from custom software. First step should be creation of RFC document, but I didn't receive confirmation e-mail from wiki, so I can't add it there directly. I tried with this and gmail.com e-mail address, so I would be greatful if somebody could help me with that. Basically, library now uses EAN-13[1] barcode which is zero-padded primary key in old system istead of ISBN or ISSN. Since books allready have barcodes on them, we can't change it. To make things more insteresting, at least one barcode reader reports it as UPC-A[2] without first leading zero, since EAN-13 has backwards compatibility with it. So, my first question is should I store barcodes padded with zeros in Koha? It seems that itemBarcodeInputFilter syspref and small change to barcodedecode in C4/Circulation.pm will support both solutions, and it seems to be that 13-digit EAN-13 with padded zeros is cleaner solution. Next, I would need to implement plugin which generates new barcodes in same format (with check digit). This would involve change to autoBarcode syspref in cataloguing/value_builder/barcode.pl and new C4/Barcode/EAN13.pm to support next barcode while ignoring last checksum digit. Finally, we need to print them. PDF::Reuse::Barcode allready supports EAN13, so it seems that small change to C4/Labels/Label.pm would be sufficiant. Am I missing something important other than tests? :-) 1: http://en.wikipedia.org/wiki/EAN-13 2: http://en.wikipedia.org/wiki/UPC-A -- Dobrica Pavlinusic 2share!2flame dpavlin@rot13.org Unix addict. Internet consultant. http://www.rot13.org/~dpavlin