c2001 Endeavor Information Systems, Inc. 1 Linking & CrossRe f Harry E. Samuels Digital Library Projects Coordinator Endeavor Information Systems Inc.
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c2001 Endeavor Information Systems, Inc.
1
Linking &
CrossRefHarry E. Samuels
Digital Library Projects CoordinatorEndeavor Information Systems Inc.
c2001 Endeavor Information Systems, Inc.
What Do We Mean By Linking?• We mean linking to full-text• We mean linking to extended
services
Why Is Linking Important?• Because it makes the research
process faster and more efficient
Linking & CrossRef
c2001 Endeavor Information Systems, Inc.
What Does A Linking System Do?
• It accepts metadata from a Source• Based on the metadata and information in
its database, it determines what links should be presented to the user, and it then builds and presents those links.
• Because the library has control over the contents of the database, the linking system should only present links that are relevant and accessible to the user.
Linking & CrossRef
SourceDatabase Linking System
TargetDatabase
Metadata Link-To URL
c2001 Endeavor Information Systems, Inc.
What Is OpenURL?• A syntax for transporting metadata via http
• It looks like this: http://lfp.endinfosys.com?issn=5555-6666&date=2001&volume=1&issue=2&spage=
99
What Is A Link-To URL?• Whatever syntax a target database uses
• It may look like this: http://www.automag.com/AAOWMagazine/2001_aprilmay/pg18.asp
Linking & CrossRef
SourceDatabase Linking System
TargetDatabase
OpenURL Link-To URL
c2001 Endeavor Information Systems, Inc.
What Is In A Source Database?• It could be an abstracting or indexing database like
ProQuest or Web of Science or Silver Platter
What Is In A Target Database?• Full text as in Science Direct or Academic Press or
American Mathematical Society• Extended Services like:
– Document Delivery sites– General interest web sites– Any service for which the system can build a URL
Linking & CrossRef
SourceDatabase Y Linking System Target
Database Y
OpenURL Link-To URL
TargetDatabase X
TargetDatabase Z
Link-To URL
Link-To U
RL
SourceDatabase X
SourceDatabase Z Open
URL
OpenURL
c2001 Endeavor Information Systems, Inc.
What Is the DOI Handle System?
• Managed by International DOI Foundation (IDF)
• Uses Handle Technology from Corporation for National Research Initiatives (CNRI)
Linking & CrossRef
SourceDatabase DOI Handle System
TargetDatabase
DOI Link-To URL
http://dx.doi.org/10.1000/123456
c2001 Endeavor Information Systems, Inc.
What Is CrossRef?• Co-operative effort between 70 learned
publishers• Non-profit trade association• Enables identifier-based linking using DOIs • Registers DOIs and URLs for member
publishers• Provides metadata lookup service to
enable link resolution• Funded by look-up and deposit fees
Linking & CrossRef
CrossRef Collection Service
DOI Handle System
Publisher
Article
Metadata
DOIs
URLs
CrossRef Database
Art
icle
Met
adat
aD
OIs
DO
Is
URLs
CrossRef Query Service
Publisher
Article
Metadata
CrossRef Database
DOIs
c2001 Endeavor Information Systems, Inc.
What Is The Appropriate Copy Problem?
• The DOI Handle System has several inherent problems– It does not know if the user’s library has a
linking server and does not know the information in the linking server’s database.
– It only registers URLs for rights holders (publishers) and knows nothing about aggregator sites or local copy (electronic or hardcopy).
Linking & CrossRef
c2001 Endeavor Information Systems, Inc.
Appropriate Copy Prototype• A prototype group led by Dale
Flecker of Harvard that is testing an architecture that will put a library’s linking server back in the loop.
Linking & CrossRef
SourceDatabase DOI Handle System
PublisherDatabase
DOI Link-To URL
AggregatorDatabase
Local Copy
Linking Server
DO
I in
Ope
nUR
L
CrossRef
DOI in OpenURL
Metadata
Link-To URL
Link-To URL
Link-T
o URL
DO
I
c2001 Endeavor Information Systems, Inc.
Endeavor Linking Products• LinkFinder
– Packaged with Citation Server– Accepts metadata passed to it
from Citation Server interface and provides links to full-text (one-way linking)
– Extended service links will also be added
– Scheduled release is Summer 2001
c2001 Endeavor Information Systems, Inc.
Endeavor Linking Products• LinkFinderPlus
– Packaged with ENCompass AND sold as stand-alone product
– Accepts OpenURL from any interface including ENCompass
– Builds link-to URLs– Will be able to serve as local resolver
for appropriate copy resolution– Scheduled release is End-Of-Year
2001 (as stand-alone and packaged with ENCompass)
c2001 Endeavor Information Systems, Inc.
Important URLs• NISO Committee AX on
OpenURLhttp://library.caltech.edu/openurl
• CrossRefhttp://www.crossref.org
• The Digital Object Identifier Systemhttp://www.doi.org/
c2001 Endeavor Information Systems, Inc.
Endeavor’s ENCompass
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