Internet Resources Discovery IRD Types of Digital Libraries

Internet Resources Discovery (IRD) Types of Digital Libraries 1 T. Sharon-A. Frank

Contents Types of DLs Comparisons Additional Aspects 2 T. Sharon-A. Frank

Sample list of Digital Libraries • LOC - Library of Congress American Memory (http: //memory. loc. gov/ammem/) • NSDL - National Science DL (http: //nsdl. org) • IPL - Internet Public Library (http: //www. ipl. org) • CDL - California DL (http: //www. cdlib. org) • • 3 ADL – Alexandria DL (http: //www. alexandria. ucsb. edu) BL - British Library (http//: www. bl. uk(/ NZDL – New Zealand DL (http: //www. nzdl. org/) Einstein Archives Online (http: //www. alberteinstein. info/) T. Sharon-A. Frank

Types of DLs 4 T. Sharon-A. Frank

Web Repositories Hierarchy Digital Library (DL) Search Engine (SE) Directory (Catalog, Guide, Subject Gateway) Basic SE (BSE) Popularity SE (PSE) Meta SE (MSE) 5 Harvested DL (HDL) Stand Alone DL (SDL) T. Sharon-A. Frank Federated DL (FDL)

Types of DLs • Stand-alone Digital Library (SDL) – also self-contained, several collections • Federated Digital Library (FDL) – also confederated, networked • Harvested Digital Library (HDL) – also distributed 6 T. Sharon-A. Frank

Exemplary Digital Libraries • Stand Alone DL (SDL) • Library of Congress (LC) and National Digital Library(NDL) • Internet Public Library (IPL) • Snunit • Federated DL (FDL) • Networked Computer Science Technical Reference Library (NCSTRL) • Online Computer Library Center (OCLC) • Harvested DL (HDL) 7 • Source. Bank (http: //www. sourcebank. com/) • Article. Central. com! (http: //www. articlecentral. com/ ) • Harvest/Katsir, OAI T. Sharon-A. Frank

First Generation Digital Libraries Stand-Alone (SDL) 8 Real (Physical) Self-contained (SDL) Virtual (Symbolic) (VDL) Data-Objects Oriented Metadata Oriented Several SDL Single SDL (General) Collection (Specialty) Collection T. Sharon-A. Frank General VDL Specialty VDL Library Index Weblog List

Stand-alone Digital Library (SDL) • A regular DL • Usually localized on server/LAN • Self-contained material: – edited/generated – scanned/digitized – purchased 9 • Single or Several digital collections T. Sharon-A. Frank

Federated Digital Library (FDL) • • • Contains many autonomous libraries Usually heterogeneous repositories Connected via a network Forms a virtual library Unified/Transparent user interface ¤ The major problem is interoperability 10 T. Sharon-A. Frank

Harvested Digital Library (HDL) • Harvests digital objects, not full DLs. • Objects harvested into metadata (protocol was Harvest/SOIF, nowadays OAI). • Does not have to contain objects, just metadata/summaries. • But has regular DL characteristics. 11 T. Sharon-A. Frank

SDL vs. HDL 12 T. Sharon-A. Frank

References 13 • Academic Info: Digital Library http: //www. academicinfo. net/digital. html • Moving to the Electronic Library http: //www. sims. berkeley. edu/courses/is 101/s 96/elib. html • Digital Library Definition (ARL at DL Sun. SITE) http: //sunsite. berkeley. edu/ARL/definition. html • Digital library scope http: //www. dlib. org/metrics/public/papers/dig-lib-scope. html • What are Digital Libraries http: //www. clir. org/pubs/issues 04. html#dlf • UIUC DLI Glossary http: //dli. grainger. uiuc. edu/glossary. htm • Digital Libraries: A selected Resource Guide http: //www. lita. org/ital/1603_klemperer. htm T. Sharon-A. Frank