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Digital libraries, K. Stefanov


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  • 1. Modern repositories for storage of scientific information
    • Assoc. Prof. Dr. Krassen Stefanov
    • FMI, Director UCC
    • NIS-SU
  • 2. Digital Library (Repository)
    • Library in which collections are stored in digital formats (as opposed to print, microform, or other media) and accessible by computers
    • The digital content may be stored locally, or accessed remotely via computer networks
    • A digital library is a type of information retrieval system
    • NIS-SU
  • 3. Main functions
    • offer the outputs to the world
    • maximise the visibility and enhance impact
    • showcase and sell results / products
    • to collect and curate digital collections
    • to manage research and teaching activities
    • workspace for collaborative projects
    • development and sharing of digital teaching
    • materials and aids
    • access to student achievements
    • NIS-SU
  • 4. Some issues
    • How to collect content
    • How to look after the content
    • How to add value to the content
    • How to share information with other digital libraries
    • How to offer services to end users
    • How to ensure legally sound operations
    • How to ensure interoperability
    • How to make it sustainable
    • NIS-SU
  • 5. Metadata
    • Data about data
    • Describe various characteristics of the digital objects stored in the library
    • Used for cataloguing purposes
    • Many standards available (metadata schemes)
    • There is no official only one standard set
    • Dublin Core (DC) is de-facto standard
    • NIS-SU
  • 6. Open Access Initiative (OAI)
    • Main goal: open access as the worldwide electronic distribution of peer-reviewed literature and completely free and unrestricted access to it by all scientists, scholars, teachers, students and other curious minds
    • First declared in Budapest, best known as Berlin Declaration ( )
    • Includes (a) authors grant free access to users; (b) full version available in at least one digital library
    • NIS-SU
  • 7. OAI Protocols
    • OAI-PMH: Protocol for Metadata Harvesting – for exposing all metadata descriptions in the digital library for free use of others
    • ( pmh/ )
    • OAI-ORE: Object Reuse and Exchange – for exchange of digital objects (mainly for software programs providing authoring, exchange, reuse, visualization etc. of all digital objects in the digital library) ( ore/ )
    • NIS-SU
  • 8. European picture
    • In 2006 about 230 institutes had at least one digital library established
    • In last two years at least one new library was created daily
    • More than 95% of European digital libraries support OAI (mostly through OAI-PMH)
    • eContent and eContentplus program
    • Two big initiatives: DRIVER and Europeana
    • NIS-SU
  • 9. DRIVER
    • Digital Repository Infrastructure Vision for European Research (currently DRIVER II)
    • Main goal: to create a knowledge base for European research
    • DRIVER I funded under FP6, DRIVER II under FP7
    • Includes only OAI-compliant libraries
    • Members from almost all European countries
    • Many subject-specific libraries
    • NIS-SU
    • Common multilingual access point which will make it possible to search Europe’s distributed digital cultural heritage online
    • Many projects aiming to achieve the goal
    • Bulgarian National Library included
    • Part of the European i2010 Initiative
    • Online from 20 November 2008
    • All work coordinated by EDL Foundation
    • NIS-SU
  • 11. Features (2)
    • Provide more comprehensive user feedback (rating and annotating)
    • Recommendations and tagging services
    • Scheduler (user wizards and workflow management)
    • User wizards and workflow management
    • User Authentication and user management services
    • NIS-SU
  • 12. Features (3)
    • Community vizualization and navigation Service
    • Community participation Service
    • Interactive creation of metadata records using the RICK tool
    • Organize resources as favourites by a user via tags
    • NIS-SU
  • 13. Share.TEC system architecture
    • NIS-SU
  • 14. Share.TEC Repository
    • Share.TEC Repository (or central repository) is the main component
    • Contains metadata representing resources from the Teacher Education (TE) domain
    • Metadata are stored in CMM format
    • OAI-PMH protocol is used for search an retrieving metadata in CMM format from partners and external repositories
    • Contains the representation of TEO ( T eacher E ducation O ntology )
    • NIS-SU
  • 15. OAI-PMH Harvester
    • Special computer program which periodically connects to all metadata sources
    • Collect new instances of metadata from this sources
    • Validation of the collected metadata through the validation service
    • Publishes collected metadata to central repository via SPI ( Simple Publishing Interface ) protocol
    • NIS-SU
  • 16. Share.TEC Web Portal
    • Multilingual user interface
    • Personalization
    • Queries in the user’s native language
    • Simple and advanced range of parameters for query filtering
    • NIS-SU
  • 17. Share.TEC Web Portal (2)
    • Key parameter values automaticaly set in accordance with user profile
    • Based on TEO a multidimensional data search
    • Automatic ranking of search results in accordance with user profile characteristics
    • NIS-SU
  • 18. Partner’s and external repositories
    • External well-known digital repositories , containing relevant TE domain metadata, as well as the local repositories established at each project partner site are essential component of the system
    • To support of CMM metadata records a specific program called MMF (Metadata Migration Facility) is provided which main role is translate from well known metadata formats to CMM format.
    • NIS-SU
  • 19. RICK (Resource Integration Companion Kit)
    • RICK is a comprehensive tool for the creation of new metadata records
    • Provides support to individual user setting some of the metadata fields’ values automatically (e.g. file type, owner, date, keywords, etc.) and offering a web form for filling the required and optional field from CMM metadata format
    • NIS-SU
  • 20. User functions
    • User functions can be classified into several groups:
      • Account management functions
      • Profile management functions
      • Searching and navigation functions
      • Authoring functions
    • NIS-SU
  • 21. Account management functions
    • These are functions related to creating and removing user accounts, logging in and out of the system and password reset. They are: register, unregister, log-in, log-out, password reset, profile change.
    • NIS-SU
  • 22. Profile management functions
    • These functions allow the user to modify his/her profile and customize how Share.TEC presents information. They are: personal profile, custom front page, preferences, multilingual interface .
    • NIS-SU
  • 23. Searching and navigation functions
    • These functions provide the ability to browse, filter, and search the data which is stored at Share.TEC repository. They are: browsing (navigation), searching, filtering, and alerts .
    • NIS-SU
  • 24. Browsing (Navigation)
    • This function allows the user to browse the Share.TEC repository using different navigation paths based on TEO.
    • NIS-SU
  • 25. Searching
    • To perform searching queries against Share.TEC data the user provides a list of search criteria.
    • The searching function provides the used with forms to fill-in these criteria, performs the actual search and provides results back to the user.
    • Searching for registered users may be fine-tuned by searching preferences provided by the user in his/her profile.
    • NIS-SU
  • 26. Faceted search (filtering)
    • This function is similar to the searching in a way that it also allows the user to set criteria for filtering information.
    • The user is only given facets and constraints that make sense in the context of the items they are looking at.
    • The user always knows what to expect before they apply a constraint
    • NIS-SU
  • 27. Search Alerts
    • users may set an automatic notification system which is triggered whenever the user condition is fulfilled.
    • users receive alerts when:
      • new content with specific properties is being added to the repository by the community,
      • existing content has passed a predefined ranking threshold or
      • a new actor with specific properties is registered.
    • NIS-SU
  • 28. Authoring functions
    • These functions allow the user to contribute to the Share.TEC content by providing annotations, ranking and additional references. They are: annotation, ranking, enriching, and adding references .
    • NIS-SU
  • 29. Availability of user functions
    • NIS-SU
    05/17/10 Function Availability for users Unregistered Registered Logged out Logged in 1. Account management Register (sign up) Yes Yes – Unregister – – Yes Log in – Yes – Log out – – Yes Password reset – Yes – 2. Profile management Personal profile – – Yes Custom front page – – Yes Preferences – – Yes Multilingual interface Yes Yes Yes 3. Searching and navigation Browsing Yes Yes Yes Basic Searching Yes Yes Yes Advanced Searching – – Yes Basic Filtering Yes Yes Yes Advanced Filtering – – Yes Alerts – Yes Yes 4. Authoring Annotation – – Yes Ranking – – Yes Adding metadata – – Yes