OLAC Best Practice for extent of manifestation
Prerecording
Recording
Recording an unstructured description
Condition Option
Do not apply the option for video recordings or video games.
Condition Option
Do not apply the option for video recordings or video games.
Condition Option
Apply the option for objects if an appropriate term is not found in the Carrier Extent Unit VES. Do not apply the option for videodiscs, video games, or streaming media.
Recording a structured description
Option
Apply the option for video games.
Exact number of units not readily ascertainable
Units cannot be named concisely
Units and sets of units with identical content
Condition Option
Apply the option for streaming media. When there are multiple files of the same online resource on a specific provider's website, follow the PCC Provider-Neutral E-Resource MARC Record Guidelines and record "1 online resource (video files)" or "1 online resource (audio files)" in MARC field 300 $a, as the number of files representing the same resource may vary according to provider.
Number of subunits
Computer discs, cartridges, etc.
Filmstrips and filmslips
Flipcharts
Microfiches and microfilm
Online resources
Option
Apply the option for streaming media.
Condition Option
Do not apply the option for online video games.
Overhead transparencies
Stereographs
Videodiscs
Exact number of subunits not readily ascertainable
Subunits in multiple unit manifestations
Incomplete manifestations
Describing a manifestation that is a collection
Number of items, containers, or volumes
Storage space
Number and type of unit
Describing a part of a manifestation
Number of units or subunits in a part
Location of a part within a larger manifestation
Extent of manifestations of cartographic works
More than one cartographic unit on one or more sheets
Cartographic units presented in two or more segments
Atlases
Extent of manifestations of notated music
Extent of manifestations of still images
Two or more images on one or more units
One image spanning two or more units
Albums, portfolios, etc.
Extent of manifestations of text
Single unit manifestations
Single volumes with numbered pages, leaves, or columns
Single volumes with unnumbered pages, leaves, or columns
Numbered and unnumbered sequences
Inessential matter
Change in form of numbering within a sequence
Misleading numbering
Incomplete volumes
Pages, etc., numbered as part of a larger sequence
Complicated or irregular paging, etc.
Leaves or pages of plates
Numbered leaves or pages of plates
Unnumbered leaves or pages of plates
Folded leaves
Double leaves
Duplicated paging, etc.
Pages numbered in opposite directions
Single sheets
Single portfolios or cases
Multiple unit manifestations
Two or more volumes
Completed serials
Continuously paged volumes
Individually paged volumes
Updating loose-leafs
Two or more sheets
Two or more portfolios or cases
Extent of three-dimensional forms
Option
Apply the option for objects.
Recording an identifier
Recording an IRI
Document Date: 2026/02/06
Document: https://access.rdatoolkit.org/en-US_ala-985aaf96-9c78-3534-953f-94d0f5aa6949