of personal names, whether they are authors or not; another may have no suitable index and fall back on its keyword index; and another may have no suitable index and return an error. An attempt to remedy this situation is the Bath Profile (named after Bath, Inglaterra, where the working group first met in 1999). This document rigidly specifies the exact search syntax to employ for common bibliographic searches, and the expected behavior of Bath-compliant servers in response to these searches. Implementation of the Bath Profile has been slow but is gradually improving the Z39.50 landscape. The Bath Profile is maintained by Library and Archives Canada. Z39.50 is a pre-Web technology, and various working groups are attempting to update it to fit better into the modern environment. These attempts fall under the designation ZING (Z39.50 International: Next Generation), and pursue various strategies. The most important are the twin protocols SRU/SRW, which drop the Z39.50 communications protocol (replacing it with HTTP) but attempt to preserve the benefits of the query syntax. SRU is REST based and enables queries to be expressed in URL query strings; SRW uses SOAP. Both expect search results to be returned as XML. Since these projects allow the relatively small market for library software to benefit from the web service tools developed for much larger markets, they have a much lower barrier to entry for developers than the original Z39.50 protocol. External links Z39.50 Maintenance Agency Z39.50 Standard Document (pdf) Z39.50 Server Directory Bath Profile ZING Software Z39.50 Object Orientation Module YAZ Toolkit JZKit da:Z39.50 de:Z39.50 fr:Z39.50 pt:Z39.50 This page uses Creative Commons Licensed content from Wikipedia (ver autores).
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