NAME

MARC::Schema - Specification of the MARC21 format

SYNOPSIS

    # in Perl
    use MARC::Schema;

    my $record = {
        _id    => 'fol05865967',
        record => [
            [ 'LDR', undef, undef, '_', '00661nam  22002538a 4500' ],
            [ '001', undef, undef, '_', 'fol05865967' ],
            [ '001', undef, undef, '_', 'field is not repeatable' ],
            [   '245', '1', '0', 'a', 'Programming Perl /',
                'c', 'Larry Wall, Tom Christiansen & Jon Orwant.',
                'a', 'subfield is not repeatable',
                'x', 'unknown subfield',
            ],
            [ '999', undef, undef, '_', 'not a standard field']
        ]
    };

    # load default schema
    my $schema = MARC::Schema->new();

    # load custom schema from file
    my $schema = MARC::Schema->new({ file => share/marc-schema.json });


    # load custom schema
    my $schema = MARC::Schema->new(
        {   fields => {
                '001' => { label => 'Control Number', repetable => 0 }
            }
        }
    );
    my @check = $schema->check($record);

    # via the command line
    $ marcvalidate --file t/camel.mrc --type RAW

DESCRIPTION

MARC::Schema defines a set of MARC21 fields and subfields to validate Catmandu::MARC records. A schema is given as hash reference such as:

    {   fields => {
            LDR => {
                positions =>
                    [ { position => '00-04', label => 'Record length' } ],
                repeatable => 0,
            },
            '001' => { label => 'Control Number', repeatable => 0 }
        }
    }

For a more detailed description of the (default) schema see MARC21 structure in JSON.

METHODS

check( $record [, %options ] )

Check whether a given "Catmandu::Importer::MARC" or "MARC::Parser::*" record confirms to the schema and return a list of detected violations. Possible options include:

ignore_unknown_fields

Don't report fields not included in the schema.

ignore_unknown_subfields

Don't report subfields not included in the schema.

Errors are given as list of hash reference with keys label, message, repeatable, subfields and tag of the violated field. If key subfields is set, the field contained invalid subfields. The error field message contains a human-readable error message which for each violated field and/or subfield;

check_field( $field [, %options ] )

Check whether a MARC21 field confirms to the schema. Use same options as method check.

AUTHOR

Johann Rolschewski <jorol@cpan.org>

CONTRIBUTORS

Patrick Hochstenbach <patrick.hochstenbach@ugent.be<gt>

COPYRIGHT

Copyright 2018- Johann Rolschewski

LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

Catmandu::Validator

JSON::Schema

PICA::Schema

MARC::Lint

ACKNOWLEDGEMENT

MARC::Schema uses the MARC21 schema developed by Péter Király as default. For more information see "Metadata assessment for MARC records" and "MARC21 structure in JSON".