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3.17 Preservation History
The Preservation History (M76) element lists the preservation actions that have taken place on a record. The intent is that this element will document events that may affect the quality or accuracy of the record. A typical preservation event is format conversion (e.g. from Word to PDF).
A preservation history comprises a sequence of actions that are represented by Action (M77) subelements. Each Action (M77) documents one preservation action. In addition, two further subelements of Preservation History (M76) describe the next preservation action to be performed.
Figure 15. Subelements of the Preservation History element.
The subelements of Preservation History are:
- Action (M77). Each Action subelement documents a preservation action. Each use comprises three pieces of information: Action Date/Time (M78), Action Type (M79), and Action Description (M80).
- Action Date/Time (M78). The date and time the preservation action occurred. This should not be overspecified; for example if the date is known, but not the time, the Action Date/Time subelement should not contain the time.
- Action Type (M79). The type of the preservation action. Of the eight types listed in the NAA standard, few are expected to be commonly used with VERS. 'Imaged' and 'Microfilmed' are preservation actions dealing with physical records. 'Backed Up', 'Medium Refreshed' and 'Moved Offline' are activities that are carried out regularly and automatically in most computer systems; and are not specifically preservation activities (and would normally not be documented at all).
- Action Description (M80). A textual description of the preservation. This would normally include the user that performed the preservation action and details of the action (e.g. the software that perform the migration, and its settings).
- Next Action (M81). The next preservation action that should be performed on this record.
- Next Action Due (M82). When the next preservation action should occur.
An example of a Preservation History element follows:
<naa:PreservationHistory>
<vers:Action>
<naa:ActionDateTime>2003-03-30T05:02:38-10:00</naa:ActionDateTime>
<naa:ActionType>Migrated (Software)</naa:ActionType>
<naa:ActionDescription>Migrated from Word file format to PDF file format using Adobe Distiller. </naa:ActionDescription>
</vers:Action>
<naa:NextAction>Check Condition</naa:NextAction>
<naa:NextActionDue>2006</naa:NextActionDue>
</naa:PreservationHistory>
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