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

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

3. electronic scholarly information
A&I
e-print
FTXT
range of authorities, technologies
OPAC
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4. electronic scholarly information
A&I
e-print
FTXT
¡¡ challenges re integrated access !!
OPAC
FTXT
A&I
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5. linking A&I e-print FTXT OPAC FTXT A&I related information
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6. linking A&I e-print FTXT OPAC FTXT A&I ¿¿ interlink ??
herbert van de sompel

7. reference linking
full text

8. reference linking
full text

9. extended services
citation databases
Ulrich’s
full text
Medline

10. citation databases
extended services
full text
Ulrich’s
PubMed

11. extended services
Who is Who
Books in Print
Amazon.com

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

13. 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

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

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

16. 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

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

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

19. 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

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

21. 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

22. 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
links from a single resource to multiple resources
dynamic
context sensitiveness can be implemented
herbert van de sompel

23. 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

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

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

27. 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
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28. the Ex Libris SFX server
A&I
OpenURL
one possible service component
OPAC
FTXT
FTXT
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29. the OpenURL framework A&I ) :- ) search result fetch metadata OpenURL
other
dbase
fetch metadata
local
service
component
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30. 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
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31. 1. CookiePusher, user-profiles, DLF certificate, ...
OpenURL-awareness
1. CookiePusher, user-profiles, DLF certificate, ...
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32. OpenURL-awareness
2. for users with access to a service component, provide an OpenURL for each transported metadata-object
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33. target = service component
OpenURL-awareness
2. OpenURL:
target = service component
content = elements of the metadata, in a public syntax
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34. OpenURL examples service component = http://sfx.aaa.edu/menu record =
AU Smith, Paul
ISSN
VOLUME 12
ISSUE 3
PAGES 1-8 PY
DBASE ERL-BIOSIS
DBASE-AN

35. OpenURL examples OpenURL =
OpenURL =

36. OpenURL examples service component = http://sfx.aaa.edu/menu link =
OpenURL =

37. 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