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We use Harvard's File Information Tool Set (FITS) version 0.10.2, which invokes other tools to generate technical metadata as a scheduled job nightlythat runs twice an hour.  The job queries the repository index for repository files (content datastreams) that do not have a value in the index field describing the FITS version.  When a new content datastreams is created, as in the case of a new version of being deposited, the FITS datastream is discard and the nightly job recreates it.  The output of FITS is stored in the FITS datastream for the object and some values are indexed including:

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For specific fields being indexed see the TECHMD fields in github.com/duke-libraries.

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Additional Considerations

At present there is no process in place to regenerate technical metadata when the version of FITS changes.

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