Digital Libraries, K. Stefanov


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Digital Libraries, K. Stefanov

  1. 1. Modern repositories for storage of scientific information <ul><li>Assoc. Prof. Dr. Krassen Stefanov </li></ul><ul><li>FMI, Director UCC </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  2. 2. Digital Library (Repository) <ul><li>Library in which collections are stored in digital formats (as opposed to print, microform, or other media) and accessible by computers </li></ul><ul><li>The digital content may be stored locally, or accessed remotely via computer networks </li></ul><ul><li>A digital library is a type of information retrieval system </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  3. 3. Main functions <ul><li>offer the outputs to the world </li></ul><ul><li>maximise the visibility and enhance impact </li></ul><ul><li>showcase and sell results / products </li></ul><ul><li>to collect and curate digital collections </li></ul><ul><li>to manage research and teaching activities </li></ul><ul><li>workspace for collaborative projects </li></ul><ul><li>development and sharing of digital teaching </li></ul><ul><li>materials and aids </li></ul><ul><li>access to student achievements </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  4. 4. Some issues <ul><li>How to collect content </li></ul><ul><li>How to look after the content </li></ul><ul><li>How to add value to the content </li></ul><ul><li>How to share information with other digital libraries </li></ul><ul><li>How to offer services to end users </li></ul><ul><li>How to ensure legally sound operations </li></ul><ul><li>How to ensure interoperability </li></ul><ul><li>How to make it sustainable </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  5. 5. Metadata <ul><li>Data about data </li></ul><ul><li>Describe various characteristics of the digital objects stored in the library </li></ul><ul><li>Used for cataloguing purposes </li></ul><ul><li>Many standards available (metadata schemes) </li></ul><ul><li>There is no official only one standard set </li></ul><ul><li>Dublin Core (DC) is de-facto standard </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  6. 6. Open Access Initiative (OAI) <ul><li>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 </li></ul><ul><li>First declared in Budapest, best known as Berlin Declaration ( ) </li></ul><ul><li>Includes (a) authors grant free access to users; (b) full version available in at least one digital library </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  7. 7. OAI Protocols <ul><li>OAI-PMH: Protocol for Metadata Harvesting – for exposing all metadata descriptions in the digital library for free use of others </li></ul><ul><li>( pmh/ ) </li></ul><ul><li>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/ ) </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  8. 8. European picture <ul><li>In 2006 about 230 institutes had at least one digital library established </li></ul><ul><li>In last two years at least one new library was created daily </li></ul><ul><li>More than 95% of European digital libraries support OAI (mostly through OAI-PMH) </li></ul><ul><li>eContent and eContentplus program </li></ul><ul><li>Two big initiatives: DRIVER and Europeana </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  9. 9. DRIVER <ul><li>Digital Repository Infrastructure Vision for European Research (currently DRIVER II) </li></ul><ul><li>Main goal: to create a knowledge base for European research </li></ul><ul><li>DRIVER I funded under FP6, DRIVER II under FP7 </li></ul><ul><li>Includes only OAI-compliant libraries </li></ul><ul><li>Members from almost all European countries </li></ul><ul><li>Many subject-specific libraries </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  10. 10. EUROPEANA <ul><li>Common multilingual access point which will make it possible to search Europe’s distributed digital cultural heritage online </li></ul><ul><li> </li></ul><ul><li>Many projects aiming to achieve the goal </li></ul><ul><li>Bulgarian National Library included </li></ul><ul><li>Part of the European i2010 Initiative </li></ul><ul><li>Online from 20 November 2008 </li></ul><ul><li>All work coordinated by EDL Foundation </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  11. 11. Features (2) <ul><li>Provide more comprehensive user feedback (rating and annotating) </li></ul><ul><li>Recommendations and tagging services </li></ul><ul><li>Scheduler (user wizards and workflow management) </li></ul><ul><li>User wizards and workflow management </li></ul><ul><li>User Authentication and user management services </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  12. 12. Features (3) <ul><li>Community vizualization and navigation Service </li></ul><ul><li>Community participation Service </li></ul><ul><li>Interactive creation of metadata records using the RICK tool </li></ul><ul><li>Organize resources as favourites by a user via tags </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  13. 13. Share.TEC system architecture <ul><li>NIS-SU </li></ul>11/16/09
  14. 14. Share.TEC Repository <ul><li>Share.TEC Repository (or central repository) is the main component </li></ul><ul><li>Contains metadata representing resources from the Teacher Education (TE) domain </li></ul><ul><li>Metadata are stored in CMM format </li></ul><ul><li>OAI-PMH protocol is used for search an retrieving metadata in CMM format from partners and external repositories </li></ul><ul><li>Contains the representation of TEO ( T eacher E ducation O ntology ) </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  15. 15. OAI-PMH Harvester <ul><li>Special computer program which periodically connects to all metadata sources </li></ul><ul><li>Collect new instances of metadata from this sources </li></ul><ul><li>Validation of the collected metadata through the validation service </li></ul><ul><li>Publishes collected metadata to central repository via SPI ( Simple Publishing Interface ) protocol </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  16. 16. Share.TEC Web Portal <ul><li>Multilingual user interface </li></ul><ul><li>Personalization </li></ul><ul><li>Queries in the user’s native language </li></ul><ul><li>Simple and advanced range of parameters for query filtering </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  17. 17. Share.TEC Web Portal (2) <ul><li>Key parameter values automaticaly set in accordance with user profile </li></ul><ul><li>Based on TEO a multidimensional data search </li></ul><ul><li>Automatic ranking of search results in accordance with user profile characteristics </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  18. 18. Partner’s and external repositories <ul><li>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 </li></ul><ul><li>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. </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  19. 19. RICK (Resource Integration Companion Kit) <ul><li>RICK is a comprehensive tool for the creation of new metadata records </li></ul><ul><li>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 </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  20. 20. User functions <ul><li>User functions can be classified into several groups: </li></ul><ul><ul><li>Account management functions </li></ul></ul><ul><ul><li>Profile management functions </li></ul></ul><ul><ul><li>Searching and navigation functions </li></ul></ul><ul><ul><li>Authoring functions </li></ul></ul><ul><li>NIS-SU </li></ul>11/16/09
  21. 21. Account management functions <ul><li>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. </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  22. 22. Profile management functions <ul><li>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 . </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  23. 23. Searching and navigation functions <ul><li>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 . </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  24. 24. Browsing (Navigation) <ul><li>This function allows the user to browse the Share.TEC repository using different navigation paths based on TEO. </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  25. 25. Searching <ul><li>To perform searching queries against Share.TEC data the user provides a list of search criteria. </li></ul><ul><li>The searching function provides the used with forms to fill-in these criteria, performs the actual search and provides results back to the user. </li></ul><ul><li>Searching for registered users may be fine-tuned by searching preferences provided by the user in his/her profile. </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  26. 26. Faceted search (filtering) <ul><li>This function is similar to the searching in a way that it also allows the user to set criteria for filtering information. </li></ul><ul><li>The user is only given facets and constraints that make sense in the context of the items they are looking at. </li></ul><ul><li>The user always knows what to expect before they apply a constraint </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  27. 27. Search Alerts <ul><li>users may set an automatic notification system which is triggered whenever the user condition is fulfilled. </li></ul><ul><li>users receive alerts when: </li></ul><ul><ul><li>new content with specific properties is being added to the repository by the community, </li></ul></ul><ul><ul><li>existing content has passed a predefined ranking threshold or </li></ul></ul><ul><ul><li>a new actor with specific properties is registered. </li></ul></ul><ul><li>NIS-SU </li></ul>11/16/09
  28. 28. Authoring functions <ul><li>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 . </li></ul><ul><li>NIS-SU </li></ul>11/16/09
  29. 29. Availability of user functions <ul><li>NIS-SU </li></ul>11/16/09 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