NAME
    Data::ExternalId - Data object for external identifier.

DESCRIPTION
    Data object for external identifier. It could be defined as identifier
    key and value.

SYNOPSIS
     use Data::ExternalId;

     my $obj = Data::ExternalId->new(%params);
     my $id = $obj->id;
     my $key = $obj->key;
     my $value = $obj->value;

METHODS
  "new"
     my $obj = Data::ExternalId->new(%params);

    Constructor.

    *       "id"

            Unique identifier.

            It's optional.

    *       "key"

            External identifier key.

            It's required.

    *       "value"

            External identifier value.

            It's required.

    Returns instance of object.

  "id"
     my $id = $obj->id;

    Get unique identifier.

    Returns number.

  "key"
     my $key = $obj->key;

    Get external identifier key.

    Returns string.

  "value"
     my $value = $obj->value;

    Get external identifier value.

    Returns string.

ERRORS
     new():
              From Mo::utils::check_number_id():
                      Parameter 'id' must be a natural number.
                             Value: %s
              From Mo::utils::check_required():
                      Parameter 'key' is required.
                      Parameter 'value' is required.

EXAMPLE
     use strict;
     use warnings;

     use Data::ExternalId;

     my $obj = Data::ExternalId->new(
             'key' => 'Wikidata',
             'value' => 'Q27954834',
     );

     # Print out.
     print "External id key: ".$obj->key."\n";
     print "External id value: ".$obj->value."\n";

     # Output:
     # External id key: Wikidata
     # External id value: Q27954834

DEPENDENCIES
    Mo, Mo::utils.

REPOSITORY
    <https://github.com/michal-josef-spacek/Data-ExternalId>

AUTHOR
    Michal Josef Špaček <mailto:skim@cpan.org>

    <http://skim.cz>

LICENSE AND COPYRIGHT
    © 2025 Michal Josef Špaček

    BSD 2-Clause License

VERSION
    0.01

