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The Volume Identifier (or VID) is a system generated unique identifier for an item; this identifies individual items that may be a part of a series or a multi-volume set of works which are all identified by the same BibID.
VIDs are five digits long and numeric, usually counting from 00001 up through the last volumes in the set.
The online form element appears as below:

The Volume Identifier is generally read-only and can not be edited in the web application.
The Volume Identifier is automatically generated by the system.
The VID appears in several spots in the SobekCM METS Files. It, along with the Bibliogaphic Identifier, form the object id, which appears in the main METS tag and also the METS header. In addition, it also appears in the custom SobekCM schema.
<METS:mets OBJID="UF00078639_00006" >
<METS:metsHdr CREATEDATE="2007-11-10T14:14:44Z" ID="UF00078639_00006" LASTMODDATE="2008-09-05T06:41:01Z" RECORDSTATUS="NEW">
</METS:metsHdr>
<sobekcm:bibDesc>
<sobekcm:BibID>UF00078639</sobekcm:BibID>
<sobekcm:VID>00006</sobekcm:VID>
</sobekcm:bibDesc>
This does not map from the MARC records, as this field is not present in the book records.
This, along with the Bibliographic Identifier, forms the object id which is mapped into the 001 record identifier.
Nicola Hill, Mark Sullivan, and Laurie Taylor