Z39.50 basics
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Z39.50 is an international information retrieval standard that allows users to search and retrieve information from multiple remote databases through a single search interface. It simplifies searching by standardizing query formats and permitting communication between systems with different hardware and software. The document discusses the history and development of Z39.50, how it works using a client-server model, its features and limitations. Implementation of Z39.50 has helped revolutionize database searching for libraries and other information sectors.
Z39.50 basics
- 1. Z39.50 : THE BASICS Fay Turner National Library of Canada fay.turner@nlc-bnc.ca 1997 IFLA Conference Session - Z39.50: Information Retrieval in an Open Networked Environment National Library of Canada/Bibliothèque nationale du Canada
- 2. Z39.50 INFORMATION RETRIEVAL STANDARD λ NUMBER OF AN AMERICAN COMMUNICATION STANDARD (NISO) λ DEVELOPED TO OVERCOME PROBLEMS OF MULTIPLE DATABASE SEARCHING » DIFFERENT SCREENS, COMMAND LANGUAGES, SEARCH PROCEDURES National Library of Canada/Bibliothèque nationale du Canada
- 3. Z39.50 λ Z39.50 SIMPLIFIES SEARCHING λ ONLY NEED TO KNOW COMMANDS OF LOCAL SYSTEM λ PERMITS COMMUNICATION BETWEEN SYSTEMS USING DIFFERENT HARDWARE AND LIBRARY SOFTWARE National Library of Canada/Bibliothèque nationale du Canada
- 4. SEARCH AND RETRIEVE (SR) PROTOCOL STANDARD λ INTERNATIONAL INFORMATION RETRIEVAL STANDARD (ISO) λ COMPATIBLE SUBSET OF Z39.50 λ REPLACED BY LATEST EDITION OF Z39.50 (1995): ISO 23950 National Library of Canada/Bibliothèque nationale du Canada
- 5. Z39.50 CLIENT and SERVER λ BASED ON CLIENT / SERVER MODEL λ TWO COMPUTERS IN A PEER-TO- PEER RELATIONSHIP λ EACH COMPUTER HAS SPECIFIC TASKS FOR THE FUNCTION BEING PERFORMED λ 2 PARTS TO Z39.50: ORIGIN/TARGET National Library of Canada/Bibliothèque nationale du Canada
- 6. Z39.50 MODEL USER'S SYSTEM DATABASE SYSTEM CLIENT SERVER ORIGIN TARGET DRA, NOTIS, VTLS GEAC, OCLC, LC National Library of Canada/Bibliothèque nationale du Canada
- 7. ORIGIN SYSTEM (CLIENT) λ SOFTWARE ON LOCAL SYSTEM TRANSLATES SEARCH QUERY INTO FORMAT OF Z39.50 STANDARD λ CONNECTS TO AND SENDS QUERY TO SYSTEM HOUSING THE DATABASE λ PRESENTS RECORDS/RESULTS OF QUERY TO SEARCHER SEARCHER OF ORIGIN SYSTEM NEVER INTERACTS DIRECTLY WITH TARGET SYSTEM National Library of Canada/Bibliothèque nationale du Canada
- 8. TARGET SYSTEM (SERVER) λ COMPUTER HOUSING THE DATABASE(S) λ TRANSLATES THE Z39.50 QUERY TO SEARCH LOGIC OF DATABASE SYSTEM λ OBTAINS INFO FROM DATABASE, RETURNS IT TO ORIGIN SYSTEM λ RETURNS RECORDS OR REPORTS A RESULT SET CLIENT AND TARGET ROLES CAN BE CONTAINED IN SAME SYSTEM National Library of Canada/Bibliothèque nationale du Canada
- 9. Z39.50 FEATURES -1992 (vers.2) λ SUPPORTS BASIC BIBLIOGRAPHIC SEARCHING λ STANDARDIZES THE QUERY FORMAT TO BUILD SIMPLE OR COMPLEX SEARCHES λ ATTRIBUTES: USE, RELATION, POSITION IN FIELD, STRUCTURE, TRUNCATION, COMPLETENESS » BOOLEAN, PROXIMITY National Library of Canada/Bibliothèque nationale du Canada
- 10. Z39.50 MESSAGES - 1992 1. INIT (INITIALIZATION) 2. SEARCH 3. PRESENT 4. DELETE-RESULT-SET 5. ACCESS CONTROL 6. RESOURCE CONTROL National Library of Canada/Bibliothèque nationale du Canada
- 11. Z39.50 FEATURES - 1995 (v. 2&3) λ SEARCHING OF BIBLIOGRAPHIC AND NON-BIBLIOGRAPHIC FORMATS, E.G. FULL TEXT, VIDEO λ SORT, SCAN, SEGMENTATION, ITEM ORDER, UPDATE, ETC. λ EXPLAIN SERVICE Z39.50 STILL EVOLVING!! National Library of Canada/Bibliothèque nationale du Canada
- 12. WEB Client (Browser) HTTP WEB/Z39.50 GATEWAY HTTP Conversion Z39.50 Origin Z39.50 Target Z39.50 Server
- 13. WHAT Z39.50 IS NOT λ NOT A COMMON COMMAND LANGUAGE λ NOT A USER INTERFACE λ NOT A SPECIFICATION FOR BUILDING THE DATABASE λ NOT A SPECIFICATION FOR THE TELECOMMUNICATIONS NETWORK National Library of Canada/Bibliothèque nationale du Canada
- 14. BENEFITS 1. PERMITS INTERSYSTEM SEARCHING AND RECORD TRANSFER REGARDLESS OF SYSTEM SOFTWARE OR HARDWARE 2. PROVIDES SIMPLER ACCESS TO REMOTE DATABASES THROUGH SINGLE INTERFACE National Library of Canada/Bibliothèque nationale du Canada
- 15. BENEFITS 3. REDUCES TRAINING TIME, NEED FOR SYSTEM SPECIFIC TERMINALS OR COMPUTERS 4. CAN BE USED TO RETRIEVE BIBLIOGRAPHIC AND NON- BIBLIOGRAPHIC INFORMATION National Library of Canada/Bibliothèque nationale du Canada
- 16. IMPLEMENTATION ACTIVITIES UNITED STATES λ Z39.50 IMPLEMENTORS GROUP (ZIG) λ APPROX. 80 IMPLEMENTATIONS » AMERITECH, DRA, VTLS, GAYLORD, GEAC, ENDEAVOR, SIRSI, OVID, INNOV. INTERFACES » OCLC, RLG » COLUMBIA, DARTMOUTH, UNIV. OF CAL., U. OF FLORIDA, LIBRARY OF CONGRESS » CHEMICAL ABSTRACTS, LEXIS/NEXIS National Library of Canada/Bibliothèque nationale du Canada
- 17. IMPLEMENTATION ACTIVITIES EUROPE λ NETHERLANDS, U.K., GERMANY, ITALY » EUROPEAN COMMISSION SPONSORED PROJECTS (DALI, SOCKER, ONE, ARCA, etc.) CANADA λ NATIONAL LIBRARY OF CANADA TOOLKIT SOFTWARE λ UNIVERSITY LIBRARIES National Library of Canada/Bibliothèque nationale du Canada
- 18. CONCLUSION λ Z39.50 REVOLUTIONIZING DATABASE SEARCHING λ INVALUABLE TOOL FOR LIBRARIES AND OTHER INFORMATION SECTORS λ ISSUES TO BE RESOLVED: » PRECISION, MARC FORMAT EXCHG, » HOLDINGS, EXPLAIN, ETC. National Library of Canada/Bibliothèque nationale du Canada
- 19. Z39.50 RESOURCE PAGES ON THE WEB λ Z39.50 Maintenance Agency URL: http://lcweb.loc.gov/z3950/agency/ » official Z39.50 documents, register of implementors, profiles, interpretations, articles, etc. λ Internet Searching With Z39.50 URL: http://www.markkelly.com/z3950/ » general info, links to software, int’l activity, related standards, implementations, etc. λ Z39.50 Resources - a Pointer Page URL: http://ds.internic.net/z3950/z3950.html » pointer page to numerous Z39.50 resources and information National Library of Canada/Bibliothèque nationale du Canada
- 20. Z39.50 RESOURCE PAGES ON THE WEB λ Z39.50 Client and Web Gateway Reviews URL: http://www.dstc.edu.au/RDU/reports/zreviews/ » reviews 12 Z39.50 clients, 5 Web/Z39.50 gateways λ Catalogs with Web Interfaces: Z39.50 gateways URL: http://www.lib.ncsu.edu/staff/morgan/alcuin/ wwwed-catalogs-Z39.50.html » annotated list of Webbed sites, software and services λ Z39.50 Library Sites URL: http://www.bookwhere.com/hosts.htm National Library of Canada/Bibliothèque nationale du Canada