PREMIS in DOMS

[under construction]

Metadata in a variety of forms — technical, structural, rights, and provenance — lies at the heart of most preservation activities. While a number of detailed metadata standards exist in many specific areas, the purpose of the joint OCLC/RLG PREMIS activity was to develop an overall framework and core element set for preservation metadata. The PREMIS data model defines a number of properties of preservation significance for digital objects, events, agents, rights and permissions, and the relationships between these entities.

The PREMIS preservation metadata as defined in the PREMIS Data Dictionary is "the information a repository uses to support the digital preservation process." One of the main principles behind PREMIS is that you need to be very clear about what you are describing. PREMIS defines five kind of entities: Intellectual, Objects, Events, Agents and Rights. This is called the PREMIS data model: [indsæt figur]

• 1. Intellectual entities are conceptual and might be called "bibliographic entities".

• 2. Object entities are what are actually stores and managed in the preservation repository

• 3. Event entities aggregate information about actions that affect objects in the repository

• 4. Agent entities are actors that have roles in events and in rights statements

• 5. Rights entities aggregate information about rights and permissionsthat are directly relevant to preserving objects in the repository.

We have chosen to use only one of the entities Object (or Digital Object). Objects are what are actually stored and managed in the preservation repository. Most of PREMIS is devoted to describing digital objects. The information that can be recorded includes:

• a unique identifier for the object (type and value),
• fixity information such as a checksum (message digest) and the algorithm used to derive it,
• the size of the object,
• the format of the object, which can be specified directly or by linking to a format registry,
• the original name of the object,
• information about its creation,
• information about inhibitors,
• information about its significant properties,
• information about its environment (see below),
• where and on what medium it is stored,
• digital signature information,
• relationships with other objects and other types of entities.

Object Entity Semantic Units 1.1 objectIdentifier (M, R)

• 1.1.1 objectIdentifierType (M, NR) 1.1.2 objectIdentifierValue (M, NR)

1.2 objectCategory (M, NR) 1.3 preservationLevel (O, R) [representation, file] 1.3.1 preservationLevelValue (M, NR) [representation, file] 1.3.2 preservationLevelRole (O, NR) [representation, file] 1.3.3 preservationLevelRationale (O, R) [representation, file] 1.3.4 preservationLevelDateAssigned (O, NR) [representation, file] 1.4 significantProperties (O, R) 1.4.1 significantPropertiesType (O, NR) 1.4.2 significantPropertiesValue (O, NR) 1.4.3 significantPropertiesExtension (O, R) 1.5 objectCharacteristics (M, R) [file, bitstream] 1.5.1 compositionLevel (M, NR) [file, bitstream] 1.5.2 fixity (O, R) [file, bitstream] 1.5.2.1 messageDigestAlgorithm (M, NR) [file, bitstream] 1.5.2.2 messageDigest (M, NR) [file, bitstream] 1.5.2.3 messageDigestOriginator (O, NR) [file, bitstream] 1.5.3 size (O, NR) [file, bitstream] 1.5.4 format (M, R) [file, bitstream] 1.5.4.1 formatDesignation (O, NR) [file, bitstream] 1.5.4.1.1 formatName (M, NR) [file, bitstream] 1.5.4.1.2 formatVersion (O, NR) [file, bitstream] 1.5.4.2 formatRegistry (O, NR) [file, bitstream] 1.5.4.2.1 formatRegistryName (M, NR) [file, bitstream] 1.5.4.2.2 formatRegistryKey (M, NR) [file, bitstream] 1.5.4.2.3 formatRegistryRole (O, NR) [file, bitstream] 1.5.4.3 formatNote (O, R) [file, bitstream] 1.5.5 creatingApplication (O, R) [file, bitstream] 1.5.5.1 creatingApplicationName (O, NR) [file, bitstream] 1.5.5.2 creatingApplicationVersion (O, NR) [file, bitstream] 1.5.5.3 dateCreatedByApplication (O, NR) [file, bitstream] 1.5.5.4 creatingApplicationExtension (O, R) [file, bitstream] 1.5.6 inhibitors (O, R) [file, bitstream] 1.5.6.1 inhibitorType (M, NR) [file, bitstream] 1.5.6.2 inhibitorTarget (O, R) [file, bitstream] 1.5.6.3 inhibitorKey (O, NR) [file, bitstream] 1.5.7 objectCharacteristicsExtension (O, R) [file, bitstream 1.6 originalName (O, NR) [representation, file] 1.7 storage (M, R) [file, bitstream] 1.7.1 contentLocation (O, NR) [file, bitstream] 1.7.1.1 contentLocationType (M, NR) [file, bitstream] 1.7.1.2 contentLocationValue (M, NR) [file, bitstream] 1.7.2 storageMedium (O, NR) [file, bitstream] 1.8 environment (O, R) 1.8.1 environmentCharacteristic (O, NR) 1.8.2 environmentPurpose (O, R) 1.8.3 environmentNote (O, R) 1.8.4 dependency (O, R) 1.8.4.1 dependencyName (O, R) 1.8.4.2 dependencyIdentifier (O, R) 1.8.4.2.1 dependencyIdentifierType (M, NR) 1.8.4.2.2 dependencyIdentifierValue (M, NR) 1.8.5 software (O, R) 1.8.5.1 swName (M, NR) 1.8.5.2 swVersion (O, NR) 1.8.5.3 swType (M, NR) 1.8.5.4 swOtherInformation (O, R) 1.8.5.5 swDependency (O, R) 1.8.6 hardware (O, R) 1.8.6.1 hwName (M, NR) 1.8.6.2 hwType (M, NR) 1.8.6.3 hwOtherInformation (O, R) 1.8.7 environmentExtension (O, R) 1.9 signatureInformation (O, R) [file, bitstream] 1.9.1 signature (O, R) 1.9.1.1 signatureEncoding (M, NR) [file, bitstream] 1.9.1.2 signer (O, NR) [file, bitstream] 1.9.1.3 signatureMethod (M, NR) [file, bitstream] 1.9.1.4 signatureValue (M, NR) [file, bitstream] 1.9.1.5 signatureValidationRules (M, NR) [file, bitstream] 1.9.1.6 signatureProperties (O, R) [file, bitstream] 1.9.1.7 keyInformation (O, NR) [file, bitstream] 1.9.2 signatureInformationExtension (O, R) [file, bitstream] 1.10 relationship (O, R) 1.10.1 relationshipType (M, NR) 1.10.2 relationshipSubType (M, NR) 1.10.3 relatedObjectIdentification (M, R) 1.10.3.1 relatedObjectIdentifierType (M, NR) 1.10.3.2 relatedObjectIdentifierValue (M, NR) 1.10.3.3 relatedObjectSequence (O, NR) 1.10.4 relatedEventIdentification (O, R) 1.10.4.1 relatedEventIdentifierType (M, NR) 1.10.4.2 relatedEventIdentifierValue (M, NR) 1.10.4.3 relatedEventSequence (O, NR) 1.11 linkingEventIdentifier (O, R) 1.11.1 linkingEventIdentifierType (M, NR) 1.11.2 linkingEventIdentifierValue (M, NR) 1.12 linkingIntellectualEntityIdentifier (O, R) 1.12.1 linkingIntellectualEntityIdentifierType (M, NR) 1.12.2 linkingIntellectualEntityIdentifierValue (M, NR) 1.13 linkingRightsStatementIdentifier (O, R) 1.13.1 linkingRightsStatementIdentifierType (M, NR) 1.13.2 linkingRightsStatementIdentifierValue (M, NR)

References

PREMIS Data Dictionary for Preservation Metadata, version 2.0, PREMIS Editorial Committee, March 2008

Caplan, Priscilla: Understanding PREMIS, February 2009