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Agenda
• Overview• Data Model• Function Model
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Overview
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• Open Archival Information System
• In 2000 the Research Libraries Group (RLG) and Online Computer Library Center (OCLC) discussed how both organizations build an infrastructure for purposes of archiving digital objects.
• It guides you to build archival information system
Overview
OCLC.org
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• Purpose– Model a system for archival information, which is
represented in digital format, for long-term preservation
• Scope– Framework for long-term preservation and access– Terminology
• Architectures and Operation• Preservation strategies and techniques• Data model
Overview
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• Primary functions– To preserve digital resource over an extended
period of time– To provide user access to the information in
archives
Overview
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• Roles– Producer - a data provider– Management - an administrator– Consumer - a data retriever
• Important functions– Ingest - submit data to system– Store - preserve data in system– Access - retrieve data from
system
High Level Concept
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High Level Concept
Person(s), or client systems, who provide the information to be preserved Person(s) who set the
overall policy of the OAIS. Management is separatefrom administrative functions
Person(s), or client systems who interact with the OAIS system and services
OCLC.org
Roles
OAIS(archive)
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High Level Concept
OCLC.org
Important functionsAnd workflow
IngestStore
Access
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• Producer– Ingest digital resource to system
• Management– Monitor, verify digital resource, do
preservation planning, migrate digital resource, and etc.
• Consumer– Search and access digital resource in repository
High Level Concept
Roles and responsibilities
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Data Model
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DIP
Information Package
AIP
SIP
Producer
Administrator
Consumer
Ingest
Store
Query
Access
3 important functions, 3 package types, and 3 roles
Disseminate
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Information Package Types
SIP AIP DIP
SIP• A form of package that the is
suitable to ingest to the system by the producer.
• Majorly, SIP contains Content Info and PDI.
• Multiple SIPs may associate with the same PDI.
AIP• A form of package that is suitable
stored in the system.• One or more SIPs is transformed to
AIP that has complete set of PDI associated Content Info.
• AIP may be a collection of AIPs.
DIP• A form of package that is suitable to
disseminate to consumer.• AIP is transformed to DIP for sharing
purpose.• DIP may contains one or more AIP that
may not has complete set of PDI.
OCLC.org
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Package model
4 Simple information concepts
ContentInformation
PDIPreservationDescriptionInformation
Archive Packaging Information
DescriptiveInformation
about Package 1
Package 1
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• Data Object– It is an object that need to preserve.– It can be either physical thing in the real world or
digital object content containing bit string.– In this case, it can be file content (1010101010101110101
000101010101001010…..) of image file of Thailand Map– In fact, it is just a string of bit that has no meaning if no
one cannot understand.
Content Information
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• Representation Information– A bit string(100111010…) may be useless if no one knows its
meaning. The representation Information inform what structure of “100111010…” is and how to interpret it.
– It may has representation of representation if the data object content has complex structure or encode by many level
Information Model
Format in byte form Construct JPEG format structure
Interpret to color of pixelsto be a picture
Rawbit string
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FunctionModel
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Functional Models
Big picture of all functions and flow of packages
OCLC.org
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Functional Models
Big picture of all functions and flow of packages
OCLC.org, CORNELL.edu
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• Accept SIPs from Producers • Verify SIPs that user submits• Generate AIPs for archive storage
Ingest
Overview
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• The main task is to store data.• It also maintains data and guarantee that
preservation data still be accessible form constrain of media and security
• Furthermore, it provides disaster recovery capabilities
Archival Storage
Overview
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• Mainly, the API works for many functions related to database– Manage DB configuration– Maintain database schema– Define integrity constrains– Perform DB update– Perform query management
Data Management
Overview
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Administration
• Solicit and negotiate submission agreement– With producer
• Audit submission– To ensure that they meet standard
• Maintain Configuration Management of– System hardware– Software
• Day-to-day governance of the other OAIS functional entities
Overview
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• Establish Standards and Policies– Manage standards and policies in order to approve migration
and replication processes• Audit Submission
– Verify that AIP and SIP is following specification and agreement– Ensure that PID is understandable for the digital resource
• Activate Requests– To check the request of consumer is correct, then submit the
request to Access• Customer Service
– Provide functions to manage user’s account
Administration
Description (cont)
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• Monitor environment of OAIS• Provide recommendations– Still accessible?– Long-term?– If original computing environment becomes
obsolete?
Preservation Planning
Overview
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• Determine– Existence– Description– Location– AvailabilityOf information in OAIS
• Allow Consumer– Request– RetrieveInformation of Products
Access
Overview
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Summary
OCLC.org
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Summary
• Producer– Ingest package to system
• System store AIP in Archival storage• System store descriptive metadata in Data management
• Consumer– Query data via Access
• Query from descriptive metadata from Data management
– Retrieve data via Access• Get data from Archival storage
• Management– Manage and monitor every flow in system
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