OpenMIC Metadata Guide

Descriptive Metadata


Section: Presentation Format

Last updated: January 8th, 2009
Name
physicalDescription
Schema
MODS
Definition
This section contains information relating to the physical description of the resource.

physicalDescription has the following components:
  • Subelements:
    • form
    • extent
    • internetMediaType
    • note
    • digitalOrigin
Usage Note
Physical description of a physical piece belongs in Source metadata.

A note on duration and extent for time-based media: For film, video, and audio, the duration of the content is recorded twice. Because the duration of the content, often expressed in minutes, pertains to the intellectual work itself (as opposed to a particular manifestation of it on videotape or in a digital file), it is recorded first in Descriptive metadata, as EXTENT. (Information about a particular manifestation of the work is recorded in Source or Technical metadata.) In Descriptive metadata, a film's extent might be described as "99 minute(s)."

Second, the duration of a particular manifestation is described in Source or Technical metadata as a timecode, in the DURATION element. For example, a title consisting of two videocassettes, each 60 minutes in duration, would have a duration of two hours, or 02:00:00:000/1000. (Do not confuse this timecode value with the actual timecode found on the physical piece; information about that timecode, such as type of timecode and how it is recorded on the media, is recorded in the TIMECODE element.)

The extent of the physical item, in terms of physical pieces, is recorded in the EXTENT elements, in Source metadata. For example, "2 videocassette(s)."

The actual length (linear measure) of the physical piece is recorded in the LENGTH element, in Source metadata. For example, "232 ft."

For digital video and audio, the breakdown of content, in terms of segment start and stop times, is handled in the structure map.

Repeatable
Y
Name
physicalDescriptionForm
Group Label
Presentation Format - Form
Definition
A designation of a particular physical presentation of a resource.

form has the following components:
  • A value
  • Attributes:
    • authority
Label
Presentation Format - Form - Value
Usage Note
Terms may be taken from the Library of Congress' Source Codes for Form [http://www.loc.gov/marc/sourcecode/form/formlist.html]
Example(s)
1 photograph
Name
physicalDescriptionFormAuthority
Label
Presentation Format - Form - Term source
Usage Note
A list of authorities is maintained at: www.loc.gov/marc/sourcecode/form/formsource.html.
Name
physicalDescriptionExtent
Group Label
Presentation Format - Extent
Definition
A statement of the number and specific material of the units of the resource that express physical extent. extent may be used with electronic resources, e.g. digitized collection of slides, to show how many slides constitute the resource.

extent has the following components:
  • Subelements:
    • type
    • value
Name
physicalDescriptionExtentType
Label
Presentation Format - Extent - Extent Unit
Controlled Vocabulary
image(s); page(s); piece(s); second(s); minute(s); hour(s); digital file(s); sheet(s); other
Name
physicalDescriptionExtentValue
Label
Presentation Format - Extent - Extent
Usage Note
A positive integer
Name
physicalDescriptionInternetMediaType
Label
Presentation Format - Internet Media Type
Definition
An identification of the electronic format type, or the data representation of the resource. The value is taken from a controlled list, especially from the Internet Media types (MIME types) (see: www.iana.org/assignments/media-types/index.html for a complete list).
Usage Note
This element provides the Internet Media type for the display objects only. Other digital instantiations are documented in Technical metadata; analog instantiations are documented in Source metadata. Electronic format types specified here may include text/html, ASCII, Postscript file, executable application or JPEG image.
Controlled Vocabulary
application/x-latex; application/gzip; application/latex; application/mathematica; application/msword; application/octet-stream; application/pdf; application/pgp-encrypted; application/pgp-keys; application/pgp-signature; application/postscript; application/rdf+xml; application/rtf; application/vnd.ms-excel; application/vnd.ms-powerpoint; application/vnd.ms-project; application/vnd.wordperfect; application/x-java-archive; application/x-java-serialized-object; application/x-java-vm; application/x-shar; application/x-shockwave-flash; application/x-tar; audio/basic; audio/G722; audio/G722.1; audio/G723; audio/mpeg; audio/mpeg4-generic; audio/quicktime; audio/x-aiff; audio/x-wav; image/jpeg; image/tiff; image/x-djvu; image/x-raw; text/html; text/sgml; text/xhtml+xml; text/xml; video/jpeg; video/mpeg; video/quicktime; video/x-flv; video/x-msvideo; other
Example(s)
application/gzip; application/pdf; application/x-latex
Name
physicalDescriptionNote
Label
Presentation Format - Note
Usage Note
General textual information pertaining to the presentation format of the display object. Do not duplicate information provided in Source or Technical metadata.
Name
physicalDescriptionDigitalOrigin
Label
n/a; does not appear on form
Definition
A designation of the source of a digital file important to its creation, use and management.
Controlled Vocabulary
born digital; reformatted digital; digitized microfilm; digitized other analog




 
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