Introduction to Digital Libraries Week 13: Reference Linking & OpenURL Old Dominion University Department of Computer Science CS 695 Fall 2005 Michael L. Nelson <mln@cs.odu.edu> All Slides From Herbert Van de Sompel <herbertv@lanl.gov> Los Alamos National Laboratory based on many of his presentations, ca. 2001 11/21/05

electronic scholarly information A&I e-print FTXT distributed OPAC herbert van de sompel

electronic scholarly information A&I e-print FTXT range of authorities, technologies OPAC herbert van de sompel

electronic scholarly information A&I e-print FTXT ¡¡ challenges re integrated access !! OPAC FTXT A&I herbert van de sompel

linking A&I e-print FTXT OPAC FTXT A&I related information herbert van de sompel

linking A&I e-print FTXT OPAC FTXT A&I ¿¿ interlink ?? herbert van de sompel

reference linking full text

reference linking full text

extended services citation databases Ulrich’s full text Medline

citation databases extended services full text Ulrich’s PubMed

extended services Who is Who Books in Print Amazon.com

linking frameworks: problems not context-sensitive static herbert van de sompel

linking frameworks static Biomednet, ISI Links, Ovid links, SilverLinker, IOP via pre-computation requires control of the information environment foolproof links herbert van de sompel

services : static & pre-computed & fool proof static links services : static & pre-computed & fool proof

static linking service extended services 5678 AB12 A server linking service link bundles 1234 5678 9100 M337 PO89 M654 AA66 AB12 AC44 link source PO89

linking frameworks static DOI/CrossRef, PubMed/PubRef identification across resources central database: unique identifiers & metadata look-up facility: input metadata; output identifier insertion of actionable identifiers in resources; identifiers point at a central resolver herbert van de sompel

linking frameworks: problems not context-sensitive herbert van de sompel

localize extended services appropriate citation databases localize extended services full text Inspec

action-radius restricted by business agreements not context-sensitive default links: restricted in nature action-radius restricted by business agreements not context-sensitive resource2 resource3 default links resource1 metadata plane herbert van de sompel

not context-sensitive linking frameworks not context-sensitive static dynamic context-sensitive herbert van de sompel

links from a single resource to a single resource Open Journals Project links from citations in journals articles to ISI citation database dynamic linking: insertion of links when articles are being delivered send PDF article through proxy on-the-fly identification of references on-the-fly matching of references with citation database on-the-fly insertion of link in case of match just-in-case linking: fool-proof computational delay not practical for provision of multiple services links from a single resource to a single resource dynamic not context sensitive herbert van de sompel

Open Citation Project links from references in e-prints in Los Alamos arXiv uses Open Journals technology to extract identification from references (batch) to prepend URL to identification (dynamic) see demo at http://arabica.ecs.soton.ac.uk/ links from a single resource to multiple resources dynamic context sensitiveness can be implemented herbert van de sompel

links from a single resource to multiple resources PubMed LinkOut links from PubMed to other resources static context-sensitive linking: institutions provide links to PubMed batch insertion of links into PubMed institutional users register to see appropriate links scalable?: extension of model would require provision of links to all resources long-term and large-scale management of links is problematic links from a single resource to multiple resources static context sensitive herbert van de sompel

links from multiple resources to multiple resources OpenURL framework links from multiple resources to multiple resources dynamic context sensitive herbert van de sompel

metadata plane resource2 resource3 default links resource1 herbert van de sompel

extended services plane component1 service component2 OpenURL appropriate links resource2 resource3 default links resource1 metadata plane herbert van de sompel

the OpenURL framework A&I FTXT OPAC FTXT by value or by reference delivery of metadata on users’ request OpenURL local service component FTXT OPAC linking server describes context FTXT herbert van de sompel

the Ex Libris SFX server A&I OpenURL one possible service component OPAC FTXT FTXT herbert van de sompel

the OpenURL framework A&I ) :- ) search result fetch metadata OpenURL other dbase fetch metadata local service component herbert van de sompel

OpenURL-awareness 1. implement a technique to make a resource understand the difference between a user that has access to a service component and one that does not herbert van de sompel

1. CookiePusher, user-profiles, DLF certificate, ... OpenURL-awareness 1. CookiePusher, user-profiles, DLF certificate, ... herbert van de sompel

OpenURL-awareness 2. for users with access to a service component, provide an OpenURL for each transported metadata-object herbert van de sompel

target = service component OpenURL-awareness 2. OpenURL: target = service component content = elements of the metadata, in a public syntax http://www.sfxit.com/OpenURL herbert van de sompel

OpenURL examples service component = http://sfx.aaa.edu/menu record = AU Smith, Paul ISSN 1234-5678 VOLUME 12 ISSUE 3 PAGES 1-8 PY 1998 DBASE ERL-BIOSIS DBASE-AN 987641

OpenURL examples OpenURL = http://sfx.aaa.edu/menu?genre=article&issn=1234-5678&volume=12&issue=3&spage=1&epage=8&date=1998&aulast=Smith&aufirst=Paul OpenURL = http://sfx.aaa.edu/menu?sid=ERL:BX&pid=987641

OpenURL examples service component = http://sfx.aaa.edu/menu link = http://dx.doi.org/10.1000/6382-1 OpenURL = http://sfx.aaa.edu/menu?id=doi:10.1000/6382-1

deployment of OpenURL framework draft OpenURL specs early 2000 lots of interest from libraries, information providers adopted by important information providers OpenURL fast track NISO standardization 2001 SFX server marketed by Ex Libris DOI/CrossRef prototype