Unit no. 5 Digital Library Adolf Knoll National Library of the Czech Republic © Adolf Knoll, National Library of the Czech Republic

Learning objectives After the completion of this unit the learner will be able to: Understand what to do with the digitized content he/she created in his/her digitization project Understand which functions of the Digital Library may be considered crucial for its successful operation Have a basic orientation in the coexistence and cooperation of the Digital Library in a larger information environment on Internet

Digital Library It is designed to aggregate the digital content that should be presented altogether It has usually two large component parts: A searchable database that is using the processed and indexed XML files from the digital documents A searchable database that is using the processed and indexed XML files from the digital documents A viewer for serving the images efficiently A viewer for serving the images efficiently The database operates centrally, but the data banks with images, audio or video files can be dispersed in Internet

DL database Data Bank 1 Data Bank 2 Data Bank n ……………………

The database The database can communicate with portals via communication protocols, preferably via OAI-PMH (Open Archive Initiative – Protocol for Metadata Harvesting) or Z39:50 (no longer preferred) OAI-PMH – it enables harvesting of metadata and creation of a central index at the portal that can navigate the user through manz digital libraries and resources from a uniform interface OAI-PMH – it enables harvesting of metadata and creation of a central index at the portal that can navigate the user through manz digital libraries and resources from a uniform interface Z39:50 – it communicates in real time and slows down the response of the portal to user’s needs Z39:50 – it communicates in real time and slows down the response of the portal to user’s needs Example: The European Library TEL is such a portal enabling fast search in hundreds of resources /

Added technological values of the digital library (DL) DL itself can implement a portal technology and via metadata harvesting offer larger services to its users / it can search in parallel in cooperating resources DL viewer can offer enhanced viewing opportunities via: Application of more image quality levels for representation of a single page/object Application of more image quality levels for representation of a single page/object Application of an image server working on demand where necessary Application of an image server working on demand where necessary Application of a combined display of image with parallel full text Application of a combined display of image with parallel full text

Manuscriptorium Digital Library viewer offers various quality levels of digital images for the same page Normal quality Thumbnail/Gallery quality Preview quality Usually the page is represented by: thumbnail preview low black-and-white normal quality images

Manuscriptorium viewer serving historical maps using Lizardtech Express Image Server – a possible solution for access to large images on Internet

Manuscriptorium Digital Library combined viewer Page image with full text

OAI-PMH profile The profile in OAI-PMH (also in Z39:50) is a metadata record that is offered by the resource to be harvested by the portal It can be any kind of agreed record, but for OAI-PMH one of the offered profiles must be a Dublin Core Unqualified record Dublin Core UnqualifiedDublin Core Unqualified

Useful references 2/usageguide/ 2/usageguide/ / Dublin Core Metadata Initiative User Guide 2/usageguide/ / Open Archives Initiative Digital Library Initiatives / there are many and should be seen as cultural and political programmes or projects / just search the web to find some of them

Examples of digital libraries GallicaGallica (National Library of France) Gallica ManuscriptoriumManuscriptorium (National Library of the Czech Republic) Manuscriptorium The New York Public Library Digital Collection The New York Public Library Digital Collection Digital Library of India Digital Library of India