Extent
Abstract
MODS Element name: <physicalDescription><extent>
Short definition: A statement of the number and specific material of the units of the resource that express physical extent.
Input guidelines: Enter the number of pages in a paginated resource, or the dimensions of bibliographic or graphic materials. Avoid using symbols to denote units of measurement (e.g. 1"). Example values include number of photographs or an image's dimensions, or duration for A/V material. The field may be used with electronic resources, e.g. for digitized collection of slides, to show how many slides constitute the resource. Consult RDA or DACS standards for best practices. Follow your unit/collection guidelines per Supervisor/Collection Owner.
Definition
A statement of the number and specific material of the units of the resource that express physical extent.
DAMS input form fields
Extent
DAMS form field name | form field type | required | MODS element | Collections Portal display | notes |
|---|---|---|---|---|---|
Extent | text field | no | extent | Extent |
MODS Element description
Element <physicalDescription>
http://www.loc.gov/standards/mods/userguide/physicaldescription.html
Guidelines for use
<physicalDescription> is a container element that contains all subelements relating to physical description information of the resource. Data is input only within each subelement.
Attributes
Currently no attributes for <physicalDescription> are implemented in the DAMS.
Subelements
The following subelements of <physicalDescription> are used in the DAMS:
extent
(internetMediaType)
(form)
Subelement <physicalDescription><extent>
Guidelines for use
Enter the number of pages in a paginated resource, or the dimensions of bibliographic or graphic materials. Avoid using symbols to denote units of measurement (e.g. 1"). Example values include number of photographs or an image's dimensions, or duration for A/V material. The element may be used with electronic resources, e.g. for digitized collection of slides, to show how many slides constitute the resource. Consult RDA or DACS standards for best practices. Follow your unit/collection guidelines per Supervisor/Collection Owner.
Attributes
Attribute name | Details | XPath syntax examples |
|---|---|---|
lang | values:
Enter ISO-639-2 language code (3 letters). Default value is "eng" for English. | physicalDescription/extent[@lang="eng"] |
Subelements
No subelements for extent.
XML Examples
<physicalDescription>
<extent lang=”eng”>236 pages</extent>
</physicalDescription>
<physicalDescription>
<extent lang=”eng”>18 X 24 inches</extent>
</physicalDescription>
<physicalDescription>
<extent>56 min.</extent>
</physicalDescription>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:format | extent | Approximate mapping. Depending on the exact content, dc:format might also map to MODS elements internetMediaType or form. |
MARC 21
see http://www.loc.gov/standards/mods/mods-mapping.html#physicaldescription. The following specific guidelines apply for the DAMS:
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 | Mapping condition | Solr DAMS | Solr Collections Portal | Notes |
|---|---|---|---|---|
extent | mods_physicalDescription_extent | mods_physicalDescription_extent |