Transcript Linking and CrossRef

Linking &
CrossRef
Harry E. Samuels
Digital Library Projects Coordinator
Endeavor Information Systems Inc.
1
c2001 Endeavor Information Systems, Inc.
Linking & CrossRef
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
c2001 Endeavor Information Systems, Inc.
Linking & CrossRef
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.
c2001 Endeavor Information Systems, Inc.
Source
Database
Linking System
Metadata
Link-To URL
Target
Database
Linking & CrossRef
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
c2001 Endeavor Information Systems, Inc.
Source
Database
Linking System
OpenURL
Link-To URL
Target
Database
Linking & CrossRef
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
c2001 Endeavor Information Systems, Inc.
Target
Database X
Source
Database X
Source
Database Y
Linking System
OpenURL
Source
Database Z
Target
Database Y
Link-To URL
Target
Database Z
Linking & CrossRef
What Is the DOI Handle System?
• Managed by International DOI
Foundation (IDF)
• Uses Handle Technology from
Corporation for National Research
Initiatives (CNRI)
c2001 Endeavor Information Systems, Inc.
Source
Database
DOI Handle System
DOI
Link-To URL
6
http://dx.doi.org/10.1000/12345
Target
Database
Linking & CrossRef
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
c2001 Endeavor Information Systems, Inc.
CrossRef Collection Service
Publisher
DOI Handle System
CrossRef Database
CrossRef Query Service
Publisher
CrossRef Database
Linking & CrossRef
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).
c2001 Endeavor Information Systems, Inc.
Linking & CrossRef
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.
c2001 Endeavor Information Systems, Inc.
Source
Database
DOI Handle System
Publisher
Database
Link-To URL
DOI
DOI in OpenURL
DOI
Aggregator
Database
DOI in OpenURL
Local Copy
Metadata
CrossRef
Linking Server
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 OpenURL
http://library.caltech.edu/openurl
• CrossRef
http://www.crossref.org
• The Digital Object Identifier
System
http://www.doi.org/
c2001 Endeavor Information Systems, Inc.
Endeavor’s ENCompass
c2001 Endeavor Information Systems, Inc.