|Field Name:||Extent is the default. However, custom-tailored field names (Dimensions, Duration, etc.) may be appropriate for an individual collection.|
|Dublin Core (DC) Mapping:||dc.format.extent|
|MARC Mapping:||300 $a (pagination or duration); 300 $b (illustrations); 300 $c (dimensions)|
|CONTENTdm Data Type:||Text|
|Dublin Core Definition:||The size or duration of the resource.|
|UA Definition:||The size or duration if deemed important for description of the resource.|
While the Digital Format element is required and uses controlled vocabulary, this optional element may be used to record additional information about the resource. Common uses would be to give the dimensions or number of pages of the original physical object being digitized or the duration of an audio or video file.
When the Extent element is being used in a collection that contains multiple kinds of resources, prefer separate Extent elements along with clarifying element names for each type of resource. For example, in a collection that contains both images and sound recordings, it would be appropriate to use name “Physical Description” or “Dimensions” for the former and “Duration” for the latter.
Enter a duration (playing time) using the applicable time elements from the W3CDTF format, separating each element with a colon. The format is as follows:
hh = two digits of hour (01, etc.)
mm = two digits of minute (00 through 59)
ss = two digits of second (00 through 59)
However, omit any element that is “00” (provided that no placeholder is needed).
A separate “File Size” element may be included when the subject selector wishes to provide this information for one or more digital objects in a collection. Likely candidates are large audio-visual or PDF files.
Use of the “File Size” element should be discussed during the initial project team meetings. The Digital Services Department will record this information for the agreed upon items in the metadata spreadsheet.
The format is number of units followed by the appropriate size designation (MB for megabytes, GB for gigabytes, etc.). For example:
3 1/2 x 5 inches
434 pages ; 29 cm
18 x 34 x 26 inches