Digital Libraries: a Reference Model

1. Digital Libraries:a Reference Model Vittore CasarosaISTI-CNR, Pisa and University of Parma, Italy LIDA 200929 May 2009, Zadar, Croatia

2. The traditional role of libraries • Mediators between information and users • Selection • Definition of collections • Acquisition • Physical objects • Description • Catalogs • Access • Shelves • Preservation • Controlled enviroment Vittore Casarosa, CNR and University of Parma, Italy

3. Libraries: some figures • Volumes (in millions) • Journals • From 10.000 in 1950 to 150.000 in 2002 • Alexandria principle beginning to fade Vittore Casarosa, CNR and University of Parma, Italy

4. Evolution of technology • Computer technology • CPU and integrated chips • Random Access Memories • RAM – from KB to GB • External memories • Tapes, hard disks, floppy disks • Memory sticks • CDs • DVDs • from MB to GB to TB to PB to EB • Communication technology (networks) • (Telephone) line speed • Point to point (leased lines) • Local Area Networks • Inter-networking (TCP/IP) Vittore Casarosa, CNR and University of Parma, Italy

5. The World Wide Web • Combination of computer technology and communication technology • It all started with the “hyperlink” • Then came the “browser” (Mosaic) • Then came the first wave • Then came the “dot come, dot gone” • Then came the second wave • Finally came the “information explosion” • An estimate of 110 to 560 million hosts • An estimate of 15 to 30 billion pages on line • And now we have Web 2.0 (with Web 3.0 just around the corner) Vittore Casarosa, CNR and University of Parma, Italy

6. DELOS main objective To define and conduct ajoint program of activities in order to integrate and coordinate the on-going research activities of the major European research teams in the field of digital libraries for the purpose of developing the next generation digital library technologies Vittore Casarosa, CNR and University of Parma, Italy

7. Digital Libraries in the Information Space High Databases/IR Structure of User Behavior Digital Libraries Web High Low Structure of Data Vittore Casarosa, CNR and University of Parma, Italy

8. • Click to add text Definition of “Digital Library” Vittore Casarosa, CNR and University of Parma, Italy

9. What is a Digital Library ? • A DL is the combination of “content and services” • A DL is an “entity” providing the functionality to mediate between information objects and information users in the context of distributed collections of information objects. This (external) functionality includes access, publish, delivery, preservation, personalization, etc. • A Digital Library is a “tool” at the centre of intellectual activity having no logical, conceptual, physical, temporal, or personal borders or barriers on information • A Digital Library is an “institution” in charge of providing at least the functionality of a traditional library in the context of distributed and networked collections of information objects Vittore Casarosa, CNR and University of Parma, Italy

10. DELOS - Grand 10610-Year Vision #1 Digital librariesshould enable any citizen to access all human knowledgeanytime and anywhere,in a friendly, multi-modal,efficient,and effective way,by overcoming barriers of distance,language, andcultureand by using multiple Internet-connecteddevices Vittore Casarosa, CNR and University of Parma, Italy

11. DELOS - Grand 10-Year Vision #2 The potential exists for digital libraries to become theuniversal knowledge repositoriesandcommunication conduitsforthefuture,acommonvehiclebywhicheveryonewillaccess,discuss, evaluate, and enhanceinformationofallforms Vittore Casarosa, CNR and University of Parma, Italy

12. Conceptual Framework Usage Management Contents Digital Library System Vittore Casarosa, CNR and University of Parma, Italy

13. Building a Digital Library Vittore Casarosa, CNR and University of Parma, Italy

14. Applications EvaluationInfrastructures e-Health, e-Learning, e-Culture, etc.… User EvaluationMethodologies UserInterfaces Visualization Personalization Horizontal Systems Repositories Architectures InformationAccess Audio/Visual SemanticInterop Foundations CurationPreservation Reference Model for DLS Research Directions in DLs Vittore Casarosa, CNR and University of Parma, Italy

15. Foundations Research Issues Reference Model for DLS Formalize a conceptual framework for Digital Library systems • to serve as a yardstick of quality and richness • to specify features and properties of generic DLMS • to clarify relationships among • digital libraries, digital repositories, digital archives, • search engines, information infrastructures, • knowledge commons Vittore Casarosa, CNR and University of Parma, Italy

16. System-related Research Issues Architectures • Peer-to-peer architectures • Grid middleware • Service-oriented architectures Information Access • Indexing for complex and novel data • Query routing in complex distributed Digital Libraries Vittore Casarosa, CNR and University of Parma, Italy

17. System-related Research Issues Audio/Visual • Automatic metadata extraction • Context-aware content-based retrieval • Audio/visual interfaces Semantic Interop. • Methods for the integration of heterogeneous ontologies and domain-specific knowledge organization systems • Interoperability with e-Learning applications Vittore Casarosa, CNR and University of Parma, Italy

18. User-related Research Issues User Interfaces • Framework for new digital library interfaces • Task-oriented user interfaces • Cooperation/collaboration tools, e.g., annotations Visualization • Self-adaptability to small screens • Visual analysis and exploration of query results Personalization • Modeling foundations for user preferences and context • Personalization of user interactions • Peer-similarity-based query routing decisions • User log analysis for profiling Vittore Casarosa, CNR and University of Parma, Italy

19. Horizontal Research Issues Curation/Preservation • Integration of preservation functionality • Establishment of a testbed and evaluation framework for preservation techniques • Automating selection and ingest processes Evaluation Methodologies Standard frameworks for comparative evaluation of DL Systems • Definition of standard events in a DL environment • Identification of appropriate metrics • Establishment of information repositories Vittore Casarosa, CNR and University of Parma, Italy

20. Applications Research Issues e-Health • Virtual electronic health records • Integration of multiple medical information streams e-Learning • Interoperability of e-Learning applications e-Culture • Integration of upper-level ontologies • Mapping of core ontologies to schemas and KOS … Vittore Casarosa, CNR and University of Parma, Italy

21. New name for Digital Libraries ? Digital REALM <adjective><content abstraction><created entity> • adjective := Digital • content abstraction := ‘’ • created entity := Library Digital REsources for Archives,Libraries and Museums Vittore Casarosa, CNR and University of Parma, Italy

22. Alternatives for new name Vittore Casarosa, CNR and University of Parma, Italy

23. DYNAMIC KNOWLEDGE UNIVERSAL COMMONS KNOWLEDGE ENVIRONMENTS What’s in a name ? DIGITAL LIBRARIES ... what's in a name? that which we call a rose, by any othername would smell as sweet…... Vittore Casarosa, CNR and University of Parma, Italy

24. Need for a Reference Model • A reference model is an abstract framework for understanding significant relationships among the entities of some environment, and for the development of consistent standards or specifications supporting that environment • A reference model is based on a small number of unifying concepts and may be used as a basis for education and explaining standards to a non-specialist • A reference model is not directly tied to any standards, technologies or other concrete implementation details, but it does seek to provide a common semantics that can be used unambiguously across and between different implementations Vittore Casarosa, CNR and University of Parma, Italy

25. A Three-Entity Framework Vittore Casarosa, CNR and University of Parma, Italy

26. The three Entities • Digital Library • An organization, which might be virtual, that comprehensively collects, manages, and preserves for the long term rich digital content, and offers to its user communities specialized functionality on that content, of measurable quality and according to codified policies • Digital Library System • A software system that is based on a defined (possibly distributed) architecture and provides all functionality required by a particular Digital Library. Users interact with a Digital Library through the corresponding Digital Library System • Digital Library Management System • A generic software system that provides the appropriate software infrastructure both (i) to produce and administer a Digital Library System incorporating the suite of functionality considered foundational for Digital Libraries and (ii) to integrate additional software offering more refined, specialized, or advanced functionality Vittore Casarosa, CNR and University of Parma, Italy

27. Different types of DLMS • Extensible Digital Library System • A complete Digital Library System that is fully operational with respect to basic/ foundational functionality required. It is based on an open software architecture, so that further software components can be incorporated on top of the ones already there with ease (DelosDLMS, GreenStone) • Digital Library System Warehouse • A collection of software components that encapsulate the core suite of DL functionality and a set of tools that can be used to combine these components in a variety of ways (in Lego-like fashion) to create Digital Library Systems offering a tailored integration of functionalities. New software components can easily be incorporated into the Warehouse for subsequent combination with those already there (BRICKS, DILIGENT) • Digital Library System Generator • A highly parameterized software system that encapsulates templates covering a broad range of functionalities, including a defined core suite of DL functionality as well as any advanced functionality that has been deemed appropriate to meet the needs of the specific application domain Through an initialization session, the appropriate parameters are set and configured; at the end of that session, an application is automatically generated, and this constitutes the Digital Library System ready for installation and deployment (MARIAN) Vittore Casarosa, CNR and University of Parma, Italy

28. DELOS DLMS Vittore Casarosa, CNR and University of Parma, Italy

29. Containment of models Vittore Casarosa, CNR and University of Parma, Italy

30. Actors in the Digital Library Vittore Casarosa, CNR and University of Parma, Italy

31. Main roles of Actors (1) • DL End-Users • They exploit the DL functionality for providing, consuming, and managing the DL Content as well as some of its other constituents They perceive the DL as a stateful entity that serves their functional needs The behaviour and output of the DL depend on its state at the time a particular part of its functionality is activated. DL end-users may be further partitioned into • Content Creators • Content Consumers • Librarians (end user) • DL Designers (Digital Librarian) • They exploit their knowledge of the semantic of the application domain to define, customize, and maintain the Digital Library so that it is aligned with the information and functional needs of its end-users To perform this task, they interact with the DLMS providing functional and content configuration parameters The values of these parameters, which can be modified during the DL lifetime, configure the specific DL perceived by the end-users because they determine the particular Digital Library System instance serving the Digital Library Vittore Casarosa, CNR and University of Parma, Italy

32. Main roles of Actors (2) • DL System Administrators (System Librarian) • They select the software components necessary to create the Digital Library System needed to serve the required DL (as specified by the DL Designer) and decide where and how to deploy them They interact with the DLMS by providing architectural configuration parameters, such as the selected software components, the hosting nodes, and the components allocation. The value of the architectural configuration parameters can be changed over the DL lifetime Any change of these parameters may result in the provision of different DL functionality and/or different quality • DL Application Developers • They develop the software components of DLMSs and DLSs, implementing the necessary functionality Vittore Casarosa, CNR and University of Parma, Italy

33. Hierarchy of Actors’ Views Vittore Casarosa, CNR and University of Parma, Italy

34. Main concepts (1) Vittore Casarosa, CNR and University of Parma, Italy

35. Main concepts (2) • Content • The Content concept encompasses the data and information that the Digital Library handles and makes available to its users Content is an umbrella concept used to aggregate all forms of information objects that a Digital Library collects, manages, and delivers It encompasses the diverse range of information objects, including such resources as objects, annotations, and metadata • User • The User concept covers the various actors (whether human or machine) entitled to interact with Digital Libraries. Digital Libraries connect actors with information and support them in their ability to consume and make creative use of it to generate new information User is an umbrella concept including all notions related to the representation and management of actor entities within a Digital Library. It encompasses such elements as the rights that actors have within the system and the profiles of the actors with characteristics that personalize the system’s behaviour or represent these actors in collaborations • Functionality • The Functionality concept encapsulates the services that a Digital Library offers to its different users, whether classes of users or individual users While the general expectation is that DLs will be rich in capabilities and services, the bare minimum of functions would include such aspects as new information object registration, search, and browse Beyond that, the system seeks to manage the functions of the Digital Library to ensure that the functions reflect the particular needs of the digital library’s community of users and/or the specific requirements relating to the Content it contains Vittore Casarosa, CNR and University of Parma, Italy

36. Main concepts (3) • Policy • The Policy concept represents the set (or sets) of conditions, rules, terms and regulations governing interaction between the Digital Library and users, whether virtual or real. Examples of policies include acceptable user behaviour, digital rights management, privacy and confidentiality, charges to users, and collection delivery • Quality • The Quality concept represents the parameters that can be used to characterize and evaluate the content and behaviour of a Digital Library. Quality can be associated not only with each class of content or functionality but also with specific information objects or services Some of these parameters are objective in nature and can be automatically measured, whereas others are subjective in nature and can only be measured through user evaluations • Architecture • The Architecture concept refers to the Digital Library System entity and represents a mapping of the functionality and content offered by a Digital Library onto hardware and software components There are two primary reasons for having Architecture as a core concept: (i) Digital Libraries are often assumed to be among the most complex and advanced forms of information systems; and (ii) interoperability across Digital Libraries is recognized as a substantial research challenge A clear architectural framework for the Digital Library System offers ammunition in addressing both these issues effectively Vittore Casarosa, CNR and University of Parma, Italy

37. User The main concepts in perspective Vittore Casarosa, CNR and University of Parma, Italy

38. The Digital Library Development Framework Vittore Casarosa, CNR and University of Parma, Italy

39. The Reference Model Vittore Casarosa, CNR and University of Parma, Italy

40. Concept Maps Vittore Casarosa, CNR and University of Parma, Italy

41. Digital Library Domains Vittore Casarosa, CNR and University of Parma, Italy

42. The Resource Domain Vittore Casarosa, CNR and University of Parma, Italy

43. The Content Domain Vittore Casarosa, CNR and University of Parma, Italy

44. The User Domain Vittore Casarosa, CNR and University of Parma, Italy

45. The Functionality Domain Vittore Casarosa, CNR and University of Parma, Italy

46. C32 Access Resource C33 Discover C34 Browse C35 Search C36 Acquire C37 Visualize C38 Manage Resource C39 Create C40 Submit C41 Withdraw C42 Update C43 Validate C44 Annotate C45 Manage Inform Object C64 Manage Actor C71 Manage Function C72 Manage Policy C73 Manage Quality Parameter C74 Collaborate C75 Exchange Information C76 Converse C77 Find Collaborator C78 Author Collaboratively C79 Manage DL C80 Manage Content C85 Manage User C90 Manage Functionality C92 Manage Quality C93 Manage Policy Domain C94 Manage & Configure DLS C95 Manage DLS C104 Configure DLS Main functions Vittore Casarosa, CNR and University of Parma, Italy

47. Manage Information Object • C46 Disseminate • C47 Publish • C48 Author • C49 Compose • C50 Process • C51 Analyze • C52 Linguistic Analysis • C53 Qualitative Analysis • C54 Examine Preservation State • C55 Statistical Analysis • C56 Scientific Analysis • C57 Create Structured Representation • C58 Compare • C59 Transform • C60 Physically Convert • C61 Translate • C62 Convert to a Different Format • C63 Extract Vittore Casarosa, CNR and University of Parma, Italy

48. Manage Actor • C65 Establish Actor • C66 Register • C67 Sign Up • C68 Login • C69 Personalise • C70 Apply Profile Vittore Casarosa, CNR and University of Parma, Italy

49. Manage DL • C80 Manage Content • C81 Manage Collection • C82 Import Collection • C83 Export Collection • C84 Preserve • C85 Manage User • C86 Manage Membership • C87 Manage Group • C88 Manage Role • C89 Manage Actor Profile • C90 Manage Functionality • C91 Monitor Usage • C92 Manage Quality • C93 Manage Policy Domain Vittore Casarosa, CNR and University of Parma, Italy

50. Manage & Configure DLS • C95 Manage DLS • C96 Create DLS • C97 Withdraw DLS • C98 Update DLS • C99 Manage Architecture • C100 Manage Architectural Component • C101 Configure Architectural Componebnt • C102 Deploy Architectural Component • C103 Monitor Architectural Component • C104 Configure DLS • C105 Configure Resource Format • C106 Configure Content • C107 Configure User • C108 Configure Functionality • C109 Configure Policy • C110 Configure Quality Vittore Casarosa, CNR and University of Parma, Italy