Catmandu::Fix::Condition::is_valid_issn - condition on validity of issn numbers
if is_valid_issn(issn_field) ... else ... end
Catmandu::Fix
To install Catmandu::Identifier, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Catmandu::Identifier
CPAN shell
perl -MCPAN -e shell install Catmandu::Identifier
For more information on module installation, please visit the detailed CPAN module installation guide.