---
name: "MARC::Spec::Subspec"
section: "3pm"
platform: "linux"
package: "libmarc-spec-perl"
version: "2.0.3-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/MARC::Spec::Subspec"
---

# MARC::Spec::Subspec(3pm)

subspec specification

## NAME

MARC::Spec::Subspec - subspec specification

## SYNOPSIS

```
    use MARC::Spec;
    use MARC::Spec::Subspec;
    use MARC::Spec::Comparisonstring;

    # create an empty subspec
    my $subspec = MARC::Spec::Subspec->new;

    # create the subterms
    my $ms  = MARC::Spec::parse('245$a')';
    my $cmp = MARC::Spec::Comparisonstring->new('Perl');

    # add subterms to subspec
    $subspec->left($ms);
    $subspec->right($cmp);
    $subspec->operator('=');

    say $subspec->subterms;     # '245$a=\Perl'
```

## DESCRIPTION

MARC::Spec::Subspec is the subspec specification of a MARC::Spec.

See MARCspec - A common MARC record path language \<http://marcspec.github.io/MARCspec/\> for further  details on the syntax.

## METHODS

### new

Create a new MARC::Spec::Subspec instance.

### to\_string

Returns the spec as a string.

## ATTRIBUTES

### left

Obligatory. The left subterm: a MARCspec as a string.

### right

Obligatory. The right subterm: a MARCspec as a string.

### operator

One of "=", "!=", "~", "!~", "!", or "?". Default is "?".

## AUTHOR

Carsten Klee `"<klee at cpan.org>"`

## CONTRIBUTORS

- •

  Johann Rolschewski, `"<jorol at cpan>"`

## COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by Carsten Klee.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

## BUGS

Please report any bugs to \<https://github.com/MARCspec/MARC-Spec/issues\>

## SEE ALSO

- •

  MARC::Spec

- •

  MARC::Spec::Field

- •

  MARC::Spec::Subfield

- •

  MARC::Spec::Indicator

- •

  MARC::Spec::Structure

- •

  MARC::Spec::Comparisonstring

- •

  MARC::Spec::Parser