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William H. Mischo, Thomas G. Habing, and Timothy
W. Cole |
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Grainger Engineering Library Information Center,
University of Illinois at Urbana-Champaign |
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JCDL 2002 |
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We have at our disposal the tools to create
integrated digital libraries from the distributed digital resources
environment in which we operate: |
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Standard retrieval environment (Web) and
interface/client (Web Browser); |
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Standard transport mechanisms to connect
heterogeneous content (HTTP, OAI, SOAP); |
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Standard metalanguage and tools for describing
and transforming content and metadata (XML, DTDs & Schemas, XSLT,
DC/DCQ, RDF, METS); |
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Standardized search/retrieval mechanisms (HTTP
Post/Get, SQL, Z39.50, Object Oriented Databases); |
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Standard linking tools and infrastructure (DOI,
OpenURL, CrossRef). |
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Candidate set of ‘best practices’ for IR. |
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Role is to bring together and integrate
disparate e-resources. |
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Provide a systematic ‘view’ of the information
landscape, particularly full-text. |
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Two primary foci: robust search/navigation and
the ability to link everywhere from anywhere in the environment of OPACs, A
& I Services, full-text. |
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Central to this implementation is simultaneous
search and reference linking technologies. |
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We live in a world of multiple, heterogeneous
information repositories, resources, portals, and IR systems. |
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OPACs, A & I Services, Web Resources and
Engines, Open and invisible Web, distributed heterogeneous publisher
repositories, OAI resources, local data, multimedia data, GIS. |
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Need for document representation, retrieval,
transmission, and linking middleware tools and standards. |
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Factor: changing landscape of Scholarly
Communication and disintermediation of publishers and libraries. |
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Simultaneous search and reference linking as
mechanism to integrate DL landscape. |
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DialIndex from Dialog. |
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Ex Libris MetaLib service. |
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Endeavor EnCompass. |
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Innovative Interfaces MetaFind. |
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Ovid Multiple Search and reference De-Duping. |
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ISI Web of Knowledge. |
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Gale Corporation InfoTrac Total Access. |
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WebFeat. |
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California Digital Library SearchLight system. |
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Los Alamos FlashPoint system. |
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Fretwell-Downing partnering with ARL Portal and
Monash. |
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Assist users in the selection of appropriate
databases . |
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Normalize user search arguments and display
search results from candidate databases. |
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Cross-database asynchronous concurrent
searching. |
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Article level and e-journal Web site access to
publisher full-text repositories. |
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Utilize OpenURL, CrossRef metadata database and
DOI for reference linking at the article level. |
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Proxying of vendor systems and capability of
‘taking over’ the search in vendor native mode. |
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Utilize Search Aid simultaneous search and link
capabilities. |
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Opportunity to explore interface and navigation
issues. |
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Mimics the behavior of reference librarian. |
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Allows the application of ‘best match’ and
‘quorum searching’ algorithms. |
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Shared Blackboard approach employing Independent
Searchbots dedicated to searching information resources and passing results
to Web clients. |
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Event-Driven, Asynchronous HTTP Queries from
within a Single Script returning results to Web browser. |
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Searchbots are separate, independent processes,
possibly across multiple servers. |
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Blackboard database allows the Web server and
the searchbots to communicate. |
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Searchbots optimized for searching different
resources. Can hold open connections and session Ids. |
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Very flexible, but complex. |
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Candidate for implementation as Web Service. |
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Single, event-driven web server process,
asynchronously querying multiple resources. |
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Uses WinHTTP from ASP and VBScript |
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Simpler, not as flexible. Search algorithms and
processing coded in scripts. |
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This is the approach we currently use for our
service. |
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Implementation of multi-step login and session
variable passthru being investigated. |
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Provides value-added links to the Ovid search
results. |
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Uses CrossRef metadata database to look up DOIs. |
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Local OpenURL services: |
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Resolver.asp |
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Callno.asp |
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Journal.asp. |
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An ActiveX DLL which can parse various Ovid
citations and turn them into OpenURLs: |
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Tansu N. Chang YL. Takeuchi T. Bour DP. Corzine
SW. Tan MRT. Mawst LJ. Temperature analysis … quantum-well lasers.
[Article] IEEE Journal of Quantum Electronics. 38(6):640-651, 2002 Jun. |
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http://…/resolver.asp?genre=article&aulast=Tansu&auinit1=N&atitle=Temperature+analysis+…+quantum-well+lasers&title=IEEE+Journal+of+Quantum+Electronics&volume=38&issue=6&spage=640&epage=651&pages=640-651&date=2002-06 |
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http://query.crossref.org/query/xref.cgi?pid=guest:guest&sid=null:null&report=NoneK&genre=article&aulast=Loke&auinit1=W&atitle=Epitaxial+growth+of+high+quality+AlGaAs/GaAs+structures+on+atomically+flat+GaAs+surfaces+in+deep+dielectric+windows+cleaned+using+atomic+hydrogen&title=Thin+Solid+Films&volume=402&issue=1-2&spage=43&epage=48&pages=43-48&date=2002-01-01 |
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CrossRef metadata database elements:
http://query.crossref.org/query/xref.cgi?pid=guest:guest&sid=null:null&report=NoneK&genre=article&title=Thin+Solid+Films&volume=402&spage=43 |
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User reactions very positive. |
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The one-stop-shopping approach has been
successful. |
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Users consider ability to link to full-text from
citations in A & I Services and from references on publisher portals
very helpful. |
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Technically, best approach appears to be a
hybrid of asynchronous client interface with Web Services querying
databases. Moves database middleware to Web Services and eliminates
extensive custom script code for search and database query. |
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Notes
