-
SRW/U erleichtert verteilte Datenbankrecherchen (2005)
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- Content
- "Seit zwei Jahrzehnten nutzen vor allem Bibliotheksverbünde das Protokoll Z39.50, um ihren Benutzern im Internet die simultane Abfrage mehrerer Datenbanken zu ermöglichen. Jetzt gibt es einen Nachfolger dieses Protokolls, der eine einfachere Implementierung verspricht. Damit ist auch eine größere Verbreitung für die Suche in verteilten Datenbeständen anderer Institutionen, wie z.B. Archiven und Museen, wahrscheinlich. SRW/U (Search and Retrieve Web Service bzw. Search and Retrieve URL Service, www.loc.90v/z3950/agency/zing/srw) wurde von einer an der Library of Congress angesiedelten Initiative entwickelt und beruht auf etablierten Standards wie URI und XML. Die mit SRW und SRU möglichen Abfragen und Ergebnisse unterscheiden sich nur in der Art der Übertragung, verwenden aber beide dieselben Prozeduren. Davon gibt es nur drei: explain, scan und searchRetrieve. Die beiden Erstgenannten dienen dazu, allgemeine Informationen über den Datenanbieter bzw. die verfügbaren Indexe zubekommen. Das Herzstück ist die search-Retrieve-Anweisung. Damit werden Anfragen direkt an die Datenbank gesendet und die Parameter des Suchergebnisses definiert. Verwendet wird dafür die Retrievalsprache CQL (Common Query Language), die simple Freitextsuchen, aber auch mit Boolschen Operatoren verknüpfte Recherchen ermöglicht. Bei SRU werden die Suchbefehle mittels einfacher HTTP GET -Anfragen übermittelt, die Ergebnisse in XML zurückgeliefert. Zur Strukturierung der Daten dienen z.B. Dublin Core, MARC oder EAD. Welches Format von der jeweiligen Datenbank bereitgestellt wird, kann durch die explain-Anweisung ermittelt gebracht werden."
-
Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993)
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- Source
- Cogito. 9(1993) H.2, S.18-22
-
Schwanter, H.: Anruf genügt : Externer OPAC in der Stadtbibliothek Chemnitz (1998)
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- Abstract
- WWW-OPACs bieten Bibliotheksnutzern die Möglichkeit, von zu Hause oder vom Arbeitsplatz aus über Internet in den Beständen zu recherchieren, unter Umständen sogar Bestellungen aufzugeben oder Verlängerungen vorzunehmen. Scheidet ein Zugang übder das Internet aber aus technischen oder finanziellen Gründen aus, bietet sich als Übergangslösung immer noch der Zugriff via Telefon an. - Am Beispiel der StB Chemnitz wird deutlich, daß dieses Konzept keienswegs überholt ist: Denn obwohl man auch in Chemnitz mittelfristig eine WWW-Lösung anstrebt, soll den Nutzern aufgrund der großen Akzeptanz auch zukünftig der OPAC-Zugriff über Telefon möglich sein. Darüber hinaus wurden in Chemnitz die OPAC-Module von Stadtbibliothek und Universitätsbibliothek gekoppelt, eine Recherche ist an den internen OPAC-Plätzen in beiden Richtungen mit demselben Funktionsumfang möglich
-
Wüst, R.: ¬Eine Einführung in der Z39.50 : ein neuer Standard und seine Bedeutung für Bibliotheken (1994)
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- Abstract
- Der Aufsatz untersucht das Z39.50 / SR Protokoll und seine Client/Server Umgebung. Die Funtionalität des Z39.50 und die Anwendung in Netzwerken wie dem Internet wird diskutiert. Die Anwendung des Z39.50 in Bibliothekssystemen wird dem Benutzer einfachen und plattformübergreifenden Zugriff auf Informationen bieten. Das Protokoll schafft eine Benutzerumgebung, die anbieterunabhängig arbeitet
-
Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994)
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- Source
- Cogito. 10(1994) H.4, S.17-22
-
Matthews, J.R.; Parker, M.R.: Local Area Networks and Wide Area Networks for libraries (1995)
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- Date
- 30.11.1995 20:53:22
-
Scheuerer, J.: Onlinebanking (1997)
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- Source
- Com!. 1997, H.8, S.22-24
-
Berezak-Lazarus, N.: ADSL - Auf der Überholspur durch die Multimedia-Welt (1999)
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- Footnote
- Rez. in: Internet Professionell 2000, H.2, S.22
-
Corey, J.F.: ¬A grant for Z39.50 (1994)
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- Abstract
- In Sept. 1990, the US Dept. of Education's Library Technology and Cooperation Grants Program awarded a three-year grant to the Florida Center for Library Automation (FCLA), an agency of the Florida State University System, to develop software adhering to the ANSI Z39.50 Information Retrieval protocol standard. The Z39.50 software was to operate over the OSI communications protocols and be integrated with FCLA's NOTIS system, which is shared by all 9 state universities in Florida. In order to test the correctness of its Z39.50 software, FCLA sought out other library software developers who would be willing to develop Z39.50 systems of their own. As part of this process, FCLA helped to found the Z39.50 Implementor's Group (ZIG), which has since gone on to improve the standard and promote Z39.50 implementations throughout much of the North American library systems marketplace. Early on in the project, it became apparent that TCP/IP would be a more heavily used communication vehicle for Z39.50 messages than OSI. FCLA expanded its design to include TCP/IP and, by the end of the grant in Sept. 1993, will have a working Z39.50 system that can communicate over both OSI and TCP/IP networks
-
Cerf, V.G.: Netztechnik (1995)
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- Pages
- S.22-31
-
Duhm, U.: Ring frei zur nächsten Runde (1999)
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- Date
- 19. 2.1999 20:21:22
-
Gottswinter, E.; Mönnich, M.W.: Brücken bauen zwischen EDV-Systemen : Einführung in die SR-Normen (1994)
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- Abstract
- Explains the basic principles of the ISO Search and Retrieve (SR) standard which facilitates the searching and retrieval of data from computers via electronic networks regardless of the hardware and software used. Provides an introduction to SR and addresses the parameters of SR servies. Abstract Syntax Notation 1 and the preliminary implementation of an SR Update Service in the KARIN cataloguing system
-
Sloan, B.G.: Remote access : design implications for the online catalog (1991)
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- Date
- 8. 1.2007 17:22:42
-
Lazinger, S.S.; Peritz, B.C.: Reader use of a nationwide research library network : local OPAC vs. remote files (1991)
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- Date
- 22. 2.1999 13:06:18
-
Millsap, L.; Ferl, T.E.: Search patterns of remote users : an analysis of OPAC transaction logs (1993)
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- Abstract
- The focus of this study is the search behavior of remote users of the University of California MELVYL Library System, an OPAC. Transaction logs from randomly selected remote user search sessions are analyzed. Descriptive data on the number and type of searches, choice of search mode and database, number of retrievals, number and type of errors, and use of system HELP facilities are presented. The search data have been cross-tabulated with demographic data on the same group of remote users, collected through an online survey conducted by the authors. Effectiveness of system usage is discussed. A case mode is made for the desirability of additional heuristics in the catalog portion of the system
-
Poo, G.-S.; Chai, B.-P.: Modularity versus efficiency in OSI system implementations (1997)
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- Abstract
- Examines a number of possible OSI system implementation strategies based on the various prevailing system facilities: processes, threads, kernel and front-end processors. Analyzes the pros and cons of the strategies showing their relative merits in implementation. The analysis leads to the recommendation of an enhanced subsystem architecture that holds the best compromise of the conflicting requirements of modularity and efficiency
-
Werner, H.-J.: ¬Die Werkzeuge liegen bereit : Infoface - eine neue Benutzeroberfläche oder ein neues Retrieval-Software-Konzept? (1993)
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-
Lynch, C.: ¬The Z39.50 information retrieval protocol : an overview and status report (1991)
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-
Ferl, T.E.; Millsap, L.: Remote use of the University of California MELVYL Library System : an online survey (1992)
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- Abstract
- This report presents the results of a survey of users who access the University of California's online union catalog, the MELVYL library system, via microcomputers with modems or connections carried through local or wide area networks. The report includes descriptive statistics on user location, status, subject interest, affiliation, in-library versus out-of-library usage patterns, need for assistance, and desire for new features
-
Peters, T.A.: ¬The online catalog : A critical examination of public use (1991)
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- COMPASS
- Information retrieval / Use of / On-line computers
- Subject
- Information retrieval / Use of / On-line computers
