Hello Sergio, the question has been asked on code2bib, the french equivalent to code4lib in July but didn't raise any answer as of today : https://groupes.renater.fr/sympa/arc/code2bib/2014-07/msg00006.html . The question was related to MARC::Lint in perl but you should be interested to contact Paul Poulain to see if he got something new since this message. Regards, Sylvain Le 23/09/2014 17:26, Sergio Letuche a écrit : > Is there any document or work done regarding UNIMARC format validation, say > we need to have the rules in order to be able to validate any records we > have against the valid values, or report wherever a certain tag is required > and is missing for example. > > Thank you in advance