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Explain Lite

Explain Lite. Research and Development activity in the ONE-2 Project - OPAC Network in Europe 2. Background. Project partners undertook significant research and development into the full Z39.50 Explain service, 1995 - 1997

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Explain Lite

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  1. Explain Lite • Research and Development activity in the ONE-2 Project - OPAC Network in Europe 2 ONE -2 OPAC Network in Europe

  2. Background • Project partners undertook significant research and development into the full Z39.50 Explain service, 1995 - 1997 • Created a fully working freeware server explain module that can be integrated into server applications - called “the PED” • Integrated explain into the freeware “ICONE” Z39.50 client • Several project partners added Explain to their targets • project liaised with ZIG and Explain test-bed ONE -2 OPAC Network in Europe

  3. Conclusions of Explain work • Explain in server requires significant development effort - not just the PDU support, but the EXP database and necessary administration components • Explain in server requires an element of data administration/maintenance: • some data can be auto-generated, eg, database size • other data requires administration effort for the data to be kept up to date, eg, contact details ONE -2 OPAC Network in Europe

  4. Conclusions of Explain work • Explain in client requires significant development work: • EXP search and retrieval • possible cache arrangements • dynamic configuration • dealing with cases where perhaps only some explain aspects are supported • Client needs to issue an explain query to see if the server supports explain or not ONE -2 OPAC Network in Europe

  5. Conclusions of Explain work • Explain “ is probably the right way to do it” but: • its never been profiled • very little take up in either clients or servers (explain test-bed had about 14 participants) • clients always need a fallback configuration anyway • very little interest shown since test bed ended • would changing / updating the model to different record formats or profiling etc encourage development support ? • This still leaves the requirement for client developers to ascertain server search and retrieval parameters. ONE -2 OPAC Network in Europe

  6. Explain - Lite: • Requirements: • to harmonize effort of a server administrator • to provide only essential components for search and retrieval • to retain the optional provision - Explain Lite info is only provided if requested • ONE 2 project is researching how the data can be otherwise used, eg: • proxy servers • client configuration ONE -2 OPAC Network in Europe

  7. Design Approach • ONE-2 project: • did not want to do this in ASN.1 • did not want to re-visit or change the current model • did want an approach that was flexible • decided to craft in XML • decided to craft onto the Init service • is aware that there are potential limitations for use, eg, may not be best suited on Init when there are many databases on a server, but: • in this case it could be useful in describing such data via web pages. ONE -2 OPAC Network in Europe

  8. Content • Contact information • Search attributes • Browse attributes • Database names • Record formats and element set names • Linkages to other related pages, eg, • same content in other languages • Data of last update - useful to avoid possible unnecessary re-cache operations in the client ONE -2 OPAC Network in Europe

  9. Flexibility • Use of XML has enabled rapid application development and ease of changes/tuning • Same XML can also be used : • in client configuration files • in proxy applications • Content can be easily parsed/verified with XML parser tools • Can use XSL to give presentation on Web pages ONE -2 OPAC Network in Europe

  10. Why this approach: • Minimum work is necessary at the PDU level for implementation • Takes advantages of current skills base • Enables administrators to harmonize explain lite with any descriptive configuration details in Web pages • Aligns with increasing use of XML with Z39.50 • May be a first step to promote implementers to think further on the full explain model • ….. This is _easy_ to do ! ONE -2 OPAC Network in Europe

  11. Current Status • Design is 99% ready • ONE-2 partners are implementing in their systems • ONE-2 project has a 7 month trial phase in 2001, and the opportunity to test and try • Design is open for anyone to have a play, we will notify ZIG when servers can be tested ONE -2 OPAC Network in Europe

  12. Example • XML example: • http://www.bibsys.no/z/bibz.xml • http://www.bibsys.no/z/spirz.xml • DTD: • http://www.bibsys.no/z/explainlite.dtd • XSL Style example: • http://www.bibsys.no/z/lite1.xsl ONE -2 OPAC Network in Europe

  13. </description> <records> <elementsetname>Full</elementsetname> <recordsyntax>USMARC</recordsyntax> <recordsyntax>NORMARC</recordsyntax> <recordsyntax>SUTRS</recordsyntax> </records> <records> <elementsetname>Brief</elementsetname> <recordsyntax>USMARC</recordsyntax> <recordsyntax>NORMARC</recordsyntax> <recordsyntax>SUTRS</recordsyntax> </records> <retrieval> <attributeset>BIB-1</attributeset> <searchattributes> <searchname>Personal name</searchname> <values> <use>1</use> <structure>1</structure> <structure>2</structure> <structure>6</structure> <structure>101</structure> </values> </searchattributes> Example XML ONE -2 OPAC Network in Europe

  14. … and on display: ONE -2 OPAC Network in Europe

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