113 sem 3_c-koscher

Society for Scholarly Publishing
May 28, 2003

Linking Implementation

Chuck Koscher
Director Of Technology

Chuck Koscher - CrossRef 1

Linking Implementation

Agenda

 Refresher on DOIs and CrossRef

CrossRef Statistics (how its going)

New Linking Services

OpenURL and DOIs/CrossRef


Refresher on DOIs and CrossRef

 A Digital Object Identifier (DOI), is a unique string created to
identify a piece of intellectual property in an online environment.


CrossRef currently accepts DOIs that identify:
 Journal articles
 Books and chapters of books (or any granularity)
 Conference Proceedings

 Guidelines are being finalized for assigning DOIs at the journal level


 What the DOI does.
Provides truly persistent hyper links to the identified entities
Makes linking more reliable
Enables locating the entity through the CrossRef database
Makes linking more accessible

HTTP://dx.doi.org/10.1016/S0040-4039(01)80789-9


 How the DOI & CrossRef Work
HTTP://dx.doi.org/10.1016/S0040-4039(01)80789-9

Constant address DOI used to ‘lookup’
of the Resolver the entity’s URL

Publisher of the 1
target entity 1. Deposit article meta-data to
CrossRef with the DOI & URL
2 2. Query CrossRef for the DOI
Publisher of the
using meta-data
referring entity
3. Present the referring article to
3 Referrer
the user with reference links
4 5 active as DOIs
Source
User
4. The user clicks on a link
5. Their browser sends the link to
the DOI Resolver
Referent
Service
6. The Resolver finds the URL and
Target 6 re-directs the user to the target
document


 How Publishers use CrossRef
1. Deposit the metadata for their articles in an XML file
(Journal / Authors / Article Title / Volume / Issue /Page / Year)
2. Parse their articles and extract the elements of each reference then query
CrossRef to find the DOIs
3. Make the reference link active by using http://dx.doi.org/<some-DOI>
 May cache the DOIs for later use
 Retrieve the DOIs as needed

 How Libraries use CrossRef
 Directly query CrossRef
(CERN is placing doi.crossref.org/resolve?<an-OpenURL in their links)
 Through local link servers to ‘reverse lookup’ the metadata for a DOI

 How the public uses CrossRef
 Indirectly every time they follow a DOI (CrossRef) enabled link
 Find DOIs using the free lookup form at www.crossref.org


The DOI Community

CERN

…and more !!
…and more !!
…and more !!

• Gateway to the DOI world

• Develops and maintains
the DOI standard
• Develops and maintains the
Handle system upon which
the DOI executes


CrossRef Statistics

 7,849,013 DOIs in the database
 209 member publishers, 86 libraries, 30 affiliates
 Over 7900 Journal Titles

3,500,000 300

3,000,000 250

2,500,000 200

2,000,000 150

1,500,000 100

1,000,000 50

500,000 0

0 -50
Jan- Mar- May- Jul- Sep- Nov- Jan- Mar- May- Jul- Sep- Nov- Jan- Mar-
01 01 01 01 01 01 02 02 02 02 02 02 03 03

DOI Resolutions CrossRef Matches Number Of Prefixes Number Of Prefixes


New Linking Services


Free DOI Queries

Parameter Passing

Forward Linking

Ambiguous Results


Free DOI Queries
 Annual fee for libraries has been dropped immediately
 Lookup fee will be eliminated as of Jan 04


Parameter Passing
 Allows the link source to pass information through the DOI
resolver to the link target (very cool!)
 Based on OpenURL 1.0

Source

HTTP://dx.doi.org/10.1038/123?rfr_dat=cr_pub=EBSCO
HTTP://dx.doi.org/10.1038/123?from=EBSCO

With Out Parameter Passing
Parameter Passing and
With Parameter Passing Registered URL
a standard vocabulary
HTTP://www.nature.com/articles?id=123

Target

HTTP://www.nature.com/articles?id=123
HTTP://www.nature.com/articles?rft_dat=id=123&rfr_dat=cr_pub=EBSCO
HTTP://www.nature.com/articles?rft_dat=id=123&from=EBSCO


Forward Linking


Forward Linking
 CrossRef forward linking will …
− Allow members to retrieve the DOI and extended
meta-data for the articles that cite a given article
− Utilize the same types of interfaces used with the
current service (deposit and query)
− Be built easily on top of existing member commitments
Couple meta-data deposits with DOI queries so we can
identify a reference’s source document.

 CrossRef forward linking is still under development …
− Indications are very encouraging, final approval
expected in Q3
− Fees and policies are TBD, but…
… we expect forward linking to be part of the core
CrossRef service


Ambiguous Results
(and other enhancements)

 When more than one DOI is found for a meta-data query
− This happens when the query has a limited number of terms
or
when the publisher’s meta-data is incomplete
or
when two or more articles have the same metadata
− Currently CrossRef returns no data
− For editorial environments return multiple hits and let the
user decide
 Other changes being implemented this year
− Enhanced query results (identify how a fuzzy match was performed)
− Forward matching (alerts that tell when a prior failed query now
matches because an article was deposited)
− Free Text queries, cut & paste the reference


OpenURL and DOIs/CrossRef

The OpenURL is “a mechanism for the representation and
transportation of specific packages of metadata and identifiers.”

The DOI and CrossRef are waypoints in the transport

 CrossRef helps solve the appropriate copy problem by
providing a ‘reverse’ DOI lookup (DOI in / meta-data out)

http://doi.crossref.org/servlet/query?id=10.1006/jmbi.2000.4282&pid=<USR>:<PWD>

 CrossRef offers an OpenURL 1.0 compliant resolver

http://doi.crossref.org/resolve?pid=<USR>:<PWD>&aulast=Maas LRM
&title= JOURNAL OF PHYSICAL OCEANOGRAPHY&volume=32&issue=3
&spage=870&date=2002

(This resolver will redirect you to the target document)

113 sem 3_c-koscher

Recommandé

Recommandé

Contenu connexe

Similaire à 113 sem 3_c-koscher

Similaire à 113 sem 3_c-koscher (20)

Plus de Society for Scholarly Publishing

Plus de Society for Scholarly Publishing (20)

113 sem 3_c-koscher