Preservation Metadata: The PREMIS Experience

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Preservation MetadataThe PREMIS Experience

• Priscilla Caplan
• Florida Center for Library Automation (FCLA)

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The Mission

• Build on the first OCLC/RLG Working Group and A
  Metadata Framework to Support the Preservation of
  Digital Objects
• Define an implementable set of core preservation
  metadata elements

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OAIS Information Model
Content Information
Preservation Descriptive Information
Content data object
Representation Information
Context Info
Reference Info
Provenance Info
Fixity Info
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What is Implementable?

• As rigorous as possible
• As much explanation as possible
• Implementation neutral -- This is what you have
  to know
• Values can be automatically supplied and
  processed -- no lengthy textual descriptions

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What is Core?

• What most working preservation repositories
• are likely to need to know
• in order to support the long-term Viability,
  Renderability, Understandability, Authenticity
  and Identity
• of archived objects.
• (Maybe.)

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PREMIS Data Model
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Types of Objects
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From the Framework
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From the Data Dictionary
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Semantic Units Pertaining to OBJECTS

• objectIdentifier
• contentLocation
• originalName
• preservationLevel
• objectCharacteristics
• environment

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objectCharacteristics

• compositionlevel
• fixity
• size
• format
• inhibitors
• significantProperties
• creatingApplication

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Composition Level
Foo.tar
Foo.tgz
Foo.PDF
.XML
.XML
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Format

• What types of objects have format?
• Is there a usable authority list of formats?
• Is there a difference between a format and a
  profile?
• Whats a format anyway?
• What if there are format registries?

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The evolution of a semantic unit

• Format
• formatValue
• formatScheme
• Format
• formatName
• formatScheme

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Evolution (2)

• formatName
• formatNameValue
• formatVersion
• formatRegistry
• formatRegistryEntry
• formatRegistryKey

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Evolution(3)

• formatName
• formatNameValue
• formatVersion
• formatRegistry
• formatRegistryIdentifier
• formatRegistryIdentifierScheme
• formatRegistryIdentifierValue
• formatRegistryName
• formatRegistryEntry

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Evolution (4)

• Format (Required, not repeatable)
• formatName (Optional, repeatable)
• formatNameValue
• formatNameVersion
• formatNameRole
• formatRegistry (optional, repeatable)
• formatRegistryIdentifier
• formatRegistryName
• formatRegistryEntry
• formatRegistryRole

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PREMIS Format Entry

• Format (Required, Not Repeatable)
• formatName (Optional, Not repeatable)
• formatNameValue
• formatVersion
• formatRegistry (Optional, Repeatable)
• formatRegistryName
• formatRegistryKey
• formatRegistryRole

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Environment

• environmentCharacteristic
• environmentPurpose
• environmentDescription
• dependencies
• software
• swName
• swVersion
• swType
• additionalReq
• swDependency

• hardware
• hwName
• hwVersion
• hwType
• additionalReq

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Events

• eventIdentifier
• eventIdentifierScheme
• eventIdentifierValue
• eventType
• eventOutcome
• eventOutcomeDetail
• eventDetail
• eventDateTime

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Agents

• agentIdentifier
• agentIdentifierScheme
• agentIdentifierValue
• agentName

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Relationships

• relationshipType
• relatedIdentifier
• relatedIdentifierType
• relatedIdentifierValue

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Rights
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Metadata Best Practices

• Have a rigorous data model and relate metadata
  clearly to appropriate objects
• Store metadata in database and also with content
  data object
• Use METS, Z39.87
• Store complete metadata for all versions of
  objects

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Deliverables

• Final report
• Data Dictionary
• Narrative explanation
• Data model
• Glossary
• Incorporation into METS schema
• Proposal for test bed exchange