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The format icons on a particular bib record are controlled by various information in the record's fixed fields and 007 (physical description).
The 007 Field
The 007 field of a record is to record the physical description. See also: The 007 Field.
It also helps determine the format icons that are used for the record.
The first character of the 007 indicates the material type, and is ignored when counting out into the 007 to get other information. On a sound recording, the first character would be s and on a video recording it would be v.
Evergreen uses some shortcut definitions from the 007 when calculating which format icons to use. Two of these “shortcuts” are called sr_format and vr_format. They are defined as:
sr_format = 3rd position in the 007 (Example: ss lunjlc||||e) – This would be an audiocassette music recording
vr_format = 4th position in the 007 (Example: vd cvaizq) – This would be a DVD
The 007 field is repeatable, so for an item that has both a DVD and Blu-Ray you would have two 007 fields.
NOTE: When written like “Type in (a,b,c)” this means that Type can be a, or b, or c.