Describes the extent of the object in terms of the physical components or units of the object. Extent is the parent element for two subelements: Value (a positive integer) and Unit (unit of measure, e.g., 'page(s)'). The subelements combine to provide the physical extent, or number of meaningful components, of the object.
Extent - Value
The number of physical units comprising the object.
The integer recorded here is designed to precede the extent Unit in public displays, resulting in a statement such as:
3 film reel(s)
Arabic numeral, positive integer.
Extent - Unit
Usually, a material designation which more specifically describes the measurable unit of physical object within the broader structure type ("source type") of film, videotape, etc.
The term recorded here is designed to follow the extent value in public displays, resulting in a statement such as:
3 film reel(s)
Photographic. negative(s); transparency(ies); print(s)
Film. film reel(s); film cartridge(s); film cassette(s) [source: AACR2]
Videotape. videocartridge(s); videocassette(s); videoreel(s) [source: AACR2]
Videodisc. videodisc(s) [source: AACR2]
Audiotape. audiocassette(s); audioreel(s); audiocartridge(s) [source: rulib]
Optical disc. CD(s) (compact disc); DVD Audio(s) [source: rulib]
Analog disc. analog disc(s) [source: rulib]
Cylinder. cylinder recording(s) [source: rulib]
Wire recording. wire recording(s) [source: rulib]
Text or graphic (paper). page(s); plate(s) [source: rulib]
Three-dimensional object. piece(s) [source: rulib]