geneva, june 2005 ole husby, bibsys
DESCRIPTION
Geneva, June 2005 Ole Husby, BIBSYS. 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) - PowerPoint PPT PresentationTRANSCRIPT
ELAG 2005 / Workshop 1: ZING
Geneva, June 2005
Ole Husby, BIBSYS
ELAG 2005 / Workshop 1: ZING
Participants
Susanna Peruginelli, ItalyEre Maijala, Finland
Maja Žumer, SloveniaPetra Otten, Netherlands
Dan Matei, RomaniaJuha Hakala, Finland
Tor Arne Dahl, NorwayJack Bazuzi, Spain
Graham Tritt, Switzerland(Peter Noerr, USA)Ole Husby, Norway
ELAG 2005 / Workshop 1: ZING
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
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
NISO metasearch initiative
TG1: Access management• surveying practice• recommendingTG2: Collection description (Juha Hakala)• collection description• service descriptionTG3: Search and retrieve (Peter Noerr)• initiative from content providers: metasearch
engines are behaving improperly
ELAG 2005 / Workshop 1: ZING
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
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
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
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
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
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
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
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
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
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
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
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
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
ELAG 2005 / Workshop 1: ZING
Z-server
Z-proxy
SR-proxy
Metasearch Portals
Personal Zclients
SR-server
Different scenarios
ELAG 2005 / Workshop 1: ZING
Z-proxySR-server
First step
ELAG 2005 / Workshop 1: ZING
SR-server
Next step