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Geneva, June 2005 Ole Husby, BIBSYS

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Dive into the workshop discussion on ZING standards, SRU/SRW, and NISO metasearch initiatives to streamline information retrieval protocols. Explore MXG proposals, CQL complexity, and aligning search tasks within SRU/SRW and OAI-PMH. Stay updated on Z39.50 migration to SRU/SRW, the importance of CQL clarity, and next version implications. Discover how ZeeRex schemas and MXG levels contribute to metadata schema profiling. Join the conversation on adopting new services for Z39.50 migration and bridging the gap with SRU/SRW. Keep abreast of the latest developments in information retrieval standards for seamless migration and enhanced access management.

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  1. Geneva, June 2005 Ole Husby, BIBSYS ELAG 2005 / Workshop 1: ZING

  2. Participants Susanna Peruginelli, Italy Ere Maijala, Finland Maja Žumer, Slovenia Petra Otten, Netherlands Dan Matei, Romania Juha Hakala, Finland Tor Arne Dahl, Norway Jack Bazuzi, Spain Graham Tritt, Switzerland (Peter Noerr, USA) Ole Husby, Norway ELAG 2005 / Workshop 1: ZING

  3. ZING defined Z39.59 International Next Generation: • SRU = Search and Retrieve URL Service • SRW = Search and Retrieve Web Service • CQL = Common Query Language • ZOOM = The Z39.59 Object-Orientation Model • Zeerex = Z39.50 Explain, Explained and Re-engineered in XML • ez3950 = Simple Implementation of Z39.50 over SOAP Using XER ELAG 2005 / Workshop 1: ZING

  4. Agenda • NISO Metasearch Initiative • SRU/SRW vs related initiatives • SRU vs SRW vs SRUP • CQL • zeeRex • New services • Migrating from Z29.50 to SRU/SRW • Toolkits (Not on the agenda: • ZOOM • ez3950 • Google) ELAG 2005 / Workshop 1: ZING

  5. NISO metasearch initiative TG1: Access management • surveying practice • recommending TG2: Collection description (Juha Hakala) • collection description • service description TG3: Search and retrieve (Peter Noerr) • initiative from content providers: metasearch engines are behaving improperly ELAG 2005 / Workshop 1: ZING

  6. More on NISO MSI TG3 • Building a reference model for metasearching (use cases, diagrams) • Scope: transferring searches to and from metasearch engines • Main problem with SRU/SRW: CQL is too complex (for some) • Content providers need something cheap or commercially favorable ELAG 2005 / Workshop 1: ZING

  7. MXG: a new protocol? • MXG: NISO Metasearch XML Gateway Protocol • A NISO MSI proposal for a lightweight protocol • Level 1: Minimal query URL requirements • Level 2: Add XML record requirements • Level 3: Add minimal CQL requirements • Try to get people on the ladder at level 1 ELAG 2005 / Workshop 1: ZING

  8. Further work on MXG • Discuss at ZING meeting later this month • Potentially submit for NISO registration • BTW: SRU/SRW has been submitted for NISO registration • Recommendation: Try to avoid treating SRU/SRW and MXG as parallel (competing) tracks within NISO ELAG 2005 / Workshop 1: ZING

  9. Other related initiatives • OpenURL is not a search protocol, it is not designed as such and should not be • OAI-PMH is related to SRU/SRW by • also returning record metadata • also requiring XML • Recommendation: There is a basis for aligning the tasks of profiling record metadata schemas within SRU/SRW and OAI-PMH ELAG 2005 / Workshop 1: ZING

  10. more related initiatives • Xpath/Xquery: not a search protocol • RSS: not a search protocol • OpenSearch (amazon.com): "something to do with searching, harvesting, syndication". NISO MSI should look into this? • OpenOffice Bibliographic project: "looks like a reference management system. It is not a search protocol". ELAG 2005 / Workshop 1: ZING

  11. SRU vs SRW (vs SRUP) • SRU = HTTP GET • (SRUP = HTTP POST without SOAP • SRUP is probably deprecated) • SRW = HTTP POST with SOAP • Recommendation: Please implement both in the server. • same recommendation as last year ... ELAG 2005 / Workshop 1: ZING

  12. SRU issues • SRU does not require a client: could run in the browser • The URL length problem in HTTP get is not trivial • See the workshop reports from last year for a more detailed treatment ELAG 2005 / Workshop 1: ZING

  13. CQL issues • Documentation: Some more clarity is asked for: Explanations, examples, pointers to external definitions • Important implementors guide: CQL Index-naming Convention, e.g.: • "attempt to determine if a suitable index name already exists ... and if so, use it rather than creating a new index name" ELAG 2005 / Workshop 1: ZING

  14. CQL next version • (part of SRU/SRW v 1.2 or 2.0) • Most important issue: notion of conformance levels (0, 1 and 2) • Recommendation: Align the XMG levels with the CQL levels, e.g. by XMG referring CQL • We do accept the difference in scope between the metasearch initiative and the SRW standardizing community, but ... ELAG 2005 / Workshop 1: ZING

  15. ZeeRex • An abstract schema as well as XML schema • To be used • by Z39.50 servers • by SRU/SRW servers • by posting XML files on the web • Feedback on Zeerex coming from the NISO MSI TG2 • Our guess: none of the metasearch portals are actually using it ... ELAG 2005 / Workshop 1: ZING

  16. please use it! • Save you're own time • Do it properly • Keep it updated • Post it on the web • Zeerex is human readable! ELAG 2005 / Workshop 1: ZING

  17. New services • One reason for extending SRU/SRW by adding new services: • Closing the gap between Z39.50 and SRU/SRW so a complete migration is possible • Candidates: • Update (Z39.50 ext. services UCP profile) • Resource delivery (Z39.50 ext. services Item Order) • but we have no recommendations! ELAG 2005 / Workshop 1: ZING

  18. Migration & toolkits • We believe there will be a migration from Z39.50 to SRU/SRW (but slowly) • And we applaud it! • Main reasons are related to • service specifications (ASN.1 -> XML/WSDL) • transport technology (sockets -> HTTP) • encoding technology (BER -> XML) • Tools / gateways / proxies are needed for migrating as well as coexisting ELAG 2005 / Workshop 1: ZING

  19. ELAG 2005 / Workshop 1: ZING

  20. Personal Zclients Different scenarios Z-server SR-proxy SR-server Z-proxy Metasearch Portals ELAG 2005 / Workshop 1: ZING

  21. First step SR-server Z-proxy ELAG 2005 / Workshop 1: ZING

  22. Next step SR-server ELAG 2005 / Workshop 1: ZING