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Keitz, W. von: Telekommunikationsdienste : eine Datenbank gibt Auskunft (1993) 0.04

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Abstract: Online-Datenbanken und Telekommunikation sind untrennbar miteinander verbunden. Ohne Telekommunikationsnetze kann man nicht auf Online-Datenbanken zugreifen. Da bleibt es nicht aus, daß unter den vielen Online-Datenbanken auch eine Datenbank angeboten wird, die über Telekommunikationsdienste Auskunft gibt. Die Rede ist von ODIN, einer Datenbank, die Informationen über die weltweit verfügbaren Text- und Datendienste bereit hält

Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 0.02

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Source: Cogito. 9(1993) H.2, S.18-22

Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 0.01

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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) 0.01

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Date: 30.11.1995 20:53:22

SRW/U erleichtert verteilte Datenbankrecherchen (2005) 0.01
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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."

Theme

Verteilte bibliographische Datenbanken

Scheuerer, J.: Onlinebanking (1997) 0.01

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Source: Com!. 1997, H.8, S.22-24

Berezak-Lazarus, N.: ADSL - Auf der Überholspur durch die Multimedia-Welt (1999) 0.01

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Footnote: Rez. in: Internet Professionell 2000, H.2, S.22

Cerf, V.G.: Netztechnik (1995) 0.01

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Pages: S.22-31

Duhm, U.: Ring frei zur nächsten Runde (1999) 0.01

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Date: 19. 2.1999 20:21:22

Sloan, B.G.: Remote access : design implications for the online catalog (1991) 0.01

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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) 0.01

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Date: 22. 2.1999 13:06:18

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