MODS Element	Attributes	Subelements
<mods:identifer>	@type	None

Usage Guidelines

1. Every MODS records should include at least one <mods:identifier><mods:type> element.
2. For digital objects, the identifier is the Fedora PID.
3. For analog resources, the <mods:identifier> is typically the ISBN or ISSN. However, in some cases a local control number, like a classification number or an accession number, may be assigned instead.
4. It is not necessary to assign an identifier to an analog resource, but it is recommended.

Elements

<mdos:identifier>

Required: Y

Repeatable: Y

MARC: 010, 020, 022, 024, 856

Definition: Contains a unique standard number or code that distinctively identifies a resource.

Attributes:

type (required): The values for this attribute are not controlled, but common examples include:

pid

isbn

issn

lccn

local

Examples

<mods:identifier type="pid">niu-lincoln:30924</mods:identifier>

<mods:identifier type="lccn">00694010</mods:identifier>