1. OAIS Rathachai Chawuthai rathachai.chawuthai@live.com Information Management CSIM / AIT Issued document 1.0

2. Overview Data Model Function Model 2

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4. O pen A rchival I nformation S ystem 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 OCLC.org 4

5. 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 5

6. Primary functions – To preserve digital resource over an extended period of time – To provide user access to the information in archives 6

7. 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 7

8. Person(s), or client systems, who provide the information to be preserved Person(s) who set the overall policy of the OAIS. Management is separate from administrative functions Person(s), or client systems who interact with the OAIS system and services OCLC.org Roles OAIS (archive) 8

9. OCLC.org Important functions And workflow Ingest Store Access 9

10. 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 Roles and responsibilities 10

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12. DIP AIP SIP Producer Administrator Consumer Ingest Store Query Access 3 important functions, 3 package types, and 3 roles Disseminate 12

13. SIPAIP 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 13

14. 4 Simple information concepts Content Information Content Information PDI Preservation Description Information PDI Preservation Description Information Archive Packaging Information Descriptive Information about Package 1 Descriptive Information about Package 1 Package 1 14

15. 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. 15

16. 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 Format in byte form Construct JPEG format structure Interpret to color of pixels to be a picture Raw bit string 16

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18. Big picture of all functions and flow of packages OCLC.org 18

19. Big picture of all functions and flow of packages OCLC.org, CORNELL.edu 19

20. Accept SIPs from Producers Verify SIPs that user submits Generate AIPs for archive storage Overview 20

21. 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 Overview 21

22. 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 Overview 22

23. 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 23

24. 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 Description (cont) 24

25. Monitor environment of OAIS Provide recommendations – Still accessible? – Long-term? – If original computing environment becomes obsolete? Overview 25

26. Determine – Existence – Description – Location – Availability Of information in OAIS Allow Consumer – Request – Retrieve Information of Products Overview 26

27. OCLC.org 27

28. 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 28

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