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For more information on OCFL, see the specification.

Note

This document is intended to provide a "logical" description of what may be found when exploring Fedora's OCFL storage root. What is actually on-disk may be different based on details of the OCFL specification. For example:

  • Identical files in the same object will only be persisted once, and referenced in the OCFL inventory.json as multiple files.
  • Each subsequent OCFL version directory will only contain the changed/added files, as opposed to the complete set of files for the OCFL object. This is the concept of "forward versioning".
  • Fedora installations that choose to disable auto-versioning will see "mutable head" directories in their OCFL objects.

To provide the most intuitive view of your OCFL storage root, it is recommended that an OCFL client be used to explore the files. 

Table of Contents

General

In the examples below, it can be seen that OCFL objects created by Fedora consist of three types of files:

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The full contents and format of the JSON "header" files, and Fedora-specific RDF files are detailed in the Specification of Fedora-specific OCFL Files section of this document. 

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