Versions Compared

Old Version 3

changes.mady.by.user Unknown User (escowles@ucsd.edu)

Saved on

compared with

New Version 4

changes.mady.by.user Unknown User (escowles@ucsd.edu)

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Types of events in the lifecycle of repository objects, drawn from the PREMIS Event Type vocabulary and augmented with some other event types identified by UCSD.  Some of these events correspond to actions performed by the Fedora 4 REST API, while others correspond to actions performed with other systems outside of the repository.  Many of the external events (e.g., compression, decompression, decryption, migration, normalization, etc.) might be followed by an internal event (content modification, metadata modification) that saves the output of the process in the repository.

Event TypeVocabularyInternal/ ExternalDescription
capturePREMISexternalThe process whereby a repository actively obtains an object.
compressionPREMISexternalThe process of coding data to save storage space or transmission time.
creationPREMISinternalThe act of creating a new object.
deaccessionPREMISexternalThe process of removing an object from the inventory of a repository.
decompressionPREMISexternalThe process of reversing the effects of compression.
decryptionPREMISexternalThe process of converting encrypted data to plain text.
deletionPREMISinternalThe process of removing an object from repository storage.
digital signature validationPREMISexternalThe process of determining that a decrypted digital signature matches an expected value.
fixity checkPREMISbothThe process of verifying that an object has not been changed in a given period.
ingestionPREMISinternalThe process of adding objects to a preservation repository.
message digest calculationPREMISexternalThe process by which a message digest ("hash") is created
  • In Fedora 4, this is done automatically when a non-RDF resource is created, which probably doesn't merit a separate event. However, message digest calculation can also be done externally before uploading content (to use the message digest to verify uncorrupted transfer), which would be a separate event.
migrationPREMISexternalA transformation of an object creating a version in a more contemporary format.
normalizationPREMISexternalA transformation of an object creating a version more conducive to preservation.
replicationPREMISexternalThe process of creating a copy of an object that is, bit-wise, identical to the original.
validationPREMISexternalThe process of comparing an object with a standard and noting compliance or exceptions.
virus checkPREMISexternalThe process of scanning a file for malicious programs.
metadata modificationUCSD internalModifying an RDF source by posting RDF, using SPARQL Update, etc. 
content modificationUCSDinternalModifying a non-RDF source by uploading updated content.
derivative creationUCSD externalGenerating derivative versions of content files.
indexingUCSD externalGenerating a derivative of an object, such as a Solr index record, updating an external triplestore, etc. possibly using the fcrepo-camel or fcrepo-message-consumer components.

...