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Abstract

REPEATABLE

MODS Element name: <identifier>

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

Input guidelines: Input one identifier per text field/element and designate the corresponding identifier type. Currently, the following identifier types are supported by the DAMS:

URI: Persistent identifier in the form of typically a URL (e.g. DOI/Handle, ARK, URN). A URI may or may not be resolvable.
PID: Persistent identifier that is not in the form of a URI
OCLC Source: OCLC number referring to a catalog entry describing the original work, e.g. the physical original of a digitized work
OCLC Surrogate: OCLC number referring to the catalog entry describing a digital copy of a work (if such a catalog entry exists)
Local: Any identifier string for local use, e.g. call number, file names or tape vault numbers.

Follow your unit/collection guidelines per Supervisor/Collection Owner for local identifiers.

The following identifier element type values are reserved for identifiers that are automatically created by the DAMS upon ingest of an asset:

utldamsURI
utldamsPID
fileName

Do not remove, alter or overwrite these identifiers. Do not use the reserved identifier type values when preparing your own metadata outside of the DAMS.

For more information see the following documentation page: Identifier (autogenerated).

Definition

Identifiers are strings of text that help to universally and specifically identify a particular resource.

DAMS input form fields

Identifier(s)

DAMS form field name

form field type

required

MODS element

Collections Portal display

notes

Identifier number/code

text field

no

identifier

Depending on the identifier Type selected for the identifier, identifier value will display as:

PID
URI
Local

Type

dropdown selection

(none/empty)
pid
uri
oclcSource
oclcSurrogate
local

no

identifier[@type]

(attribute of identifier)

Depending on the identifier Type selected for the identifier, identifier value will display as:

PID
URI
Local

MODS Element description

Element <identifier>

http://www.loc.gov/standards/mods/userguide/identifier.html

Guidelines for use

Input one identifier per text field/element and designate the corresponding identifier type. Currently, the following identifier types are supported by the DAMS:

URI: Persistent identifier in the form of typically a URL (e.g. DOI/Handle, ARK, URN). A URI may or may not be resolvable.
PID: Persistent identifier that is not in the form of a URI
OCLC Source: OCLC number referring to a catalog entry describing the original work, e.g. the physical original of a digitized work
OCLC Surrogate: OCLC number referring to the catalog entry describing a digital copy of a work (if such a catalog entry exists)
Local: Any identifier string for local use, e.g. call number, file names or tape vault numbers.

Attributes

Element Parts	Details	XPath syntax examples
type	values: pid uri oclcSource oclcSurrogate local utldamsPID utldamsURI fileName The following identifier element type values are reserved for identifiers that are automatically created by the DAMS upon ingest of an asset: utldamsURI utldamsPID fileName Do not remove, alter or overwrite these identifiers. Do not use the reserved identifier type values when preparing your own metadata outside of the DAMS. For more information see the following documentation page: Identifier (autogenerated).	identifier[@type="oclcSource"]

Subelements

No subelements for <identifier>.

XML Examples

<identifier type=”uri”>http://hdl.loc.gov/loc.law/llst.072</identifier>

<identifier type=”pid”>isla-1234567-89</identifier>

<identifier type=”oclcSource”>181516677</identifier>

<identifier type=”oclcSurrogate">789456123</identifier>

<identifier type=”local”>batch no.12456523</identifier>

Mappings

Dublin Core

Depending on the direction of mapping necessary, check

DC to MODS: https://www.loc.gov/standards/mods/dcsimple-mods.html
MODS to DC: http://www.loc.gov/standards/mods/mods-dcsimple.html

The following specific guidelines apply for the DAMS:

Dublin Core field	Mapping condition	MODS element	Notes
dc:identifier		identifier*	The MODS standard suggests to map identifiers in URL format beginning with http to a <location><url> element. The DAMS MODS does not use <url> elements outside of <relatedItem> elements. Map identifier URLs to the <identifier> element instead and assign attribute type="URI".

MARC 21

see http://www.loc.gov/standards/mods/mods-mapping.html#identifier. The following specific guidelines apply for the DAMS:

MARC 21 field	Mapping condition	MODS element	Notes
*		identifier[@type]	Currently, only the following identifier types are supported by the DAMS MODS: pid uri oclcSource oclcSurrogate
001	OCLC control/accession number of the bibliographic record refers to the analog/physical original.	identifier[@type="oclcSource"]
001	OCLC control/accession number of the bibliographic record refers to a derivative/surrogate representation.	identifier[@type="oclcSurrogate"]
856$u		identifier[@type="uri"]	URIs recorded in MARC field 856 might be or might become outdated as content is migrated into the DAMS. Check if the URI recorded in field 856 is going to remain resolvable.

Solr

In general, all MODS metadata is imported into the DAMS Solr server upon ingest. The ingest process generates Solr fields typically named according to the following schema:

mods_value*_suffix

where

value* can be one or multiple element, subelement or attribute names that allow to distinguish Solr fields
suffix is s, t, ss, ms or mt, which refers to the type of data stored in a Solr field and how it is indexed. The Solr index usually contains multiple copies of each field with the same content, distinguished by their suffix.

The following table shows mappings between MODS elements and Solr fields for those fields that are currently used for display in the Collections portal, or where additional processing happens in Islandora or during the publishing process. Suffixes are ignored, unless relevant for the mapping.

MODS element	Solr DAMS	Solr Collections Portal
identifier[@type="pid"]	mods_identifier_pid	mods_identifier_pid
identifier[@type="uri"]	mods_identifier_uri	mods_identifier_uri
identifier[@type="local"]	mods_identifier_local	mods_identifier_local