New Developments Relating to Linking Metadata Metadata Practices on the Cutting Edge May 20, 2004

1
New Developments Relatingto Linking
MetadataMetadata Practices on the Cutting
EdgeMay 20, 2004

• Chuck Koscher
• Technology Director, CrossRef
• ckoscher_at_CrossRef.org

2
CrossRefs Mission

• To provide services that bring the scholar to
  authoritative primary content, focusing on
  services that are best achieved through
  collective agreement by publishers
• Journals
• Books
• Conference proceedings
• Dissertations
• Patents
• Gray literature
• Etc

3
CrossRef Indicators

• 307 participating publishers
• 290 libraries and consortia
• 33 agents and affiliates
• 11.1 million items, 9,500 journals
• 6 million DOI resolutions/month
• 2.5 million DOIs retrieved per month
• 300,000 records updated per month
• 650,000 book and proceedings DOIs

4
DOI links being clicked
5
How DOIs CrossRef Work
HTTP//dx.doi.org/10.1016/S0040-4039(01)80789-9
Constant address of the Resolver
DOI used to lookup the entitys URL

• Deposit article meta-data to CrossRef with the
  DOI URL
• Query CrossRef for the DOI using meta-data
• Present the referring article to the user with
  reference links active as DOIs
• The user clicks on a link
• Their browser sends the link to the DOI Resolver
• The Resolver finds the URL and re-directs the
  user to the target document

6
CrossRef Developments

• Main CrossRef developments
• DOI lookups are now free
• (costs shifted to the depositing publisher)
• Article network via reference links has reached
• critical mass (DOIs are mainstream)
• Forward Linking (cited-by links)
• CrossRef Search Cross-publisher full text
  search
• Multiple resolution (the next thing)

7
DOIs in Online Full Text
8
DOIs in Reference Citations
9
DOIs as Article Locators
10
Publish Ahead of Print
11
Forward Linking

• Many publishers/hosting platforms offer this
  service
• now but only for intra-site references.
  CrossRef
• extends the reach to inter-site/inter-publisher
  .
• Publishers deposit the list of references in the
  article
• An opt-in service available to CrossRef members
• A new query to get the list of articles that
  cite
• a target article
• Alerts will be sent when a new article is
• deposited that cites the target

12
Forward Linking
13
CrossRef Search powered by Google

• CrossRef Search Pilot
• Cross-disciplinary, full text search of journals
  and conference proceedings
• Normal Google search with results limited to
  authoritative scholarly content
• Content also available in regular Google searches

14
CrossRef Search contd

• Publishers have CrossRef Search boxes on their
• normal search pages
• Pilot to run through end of 2004
• Evaluation of functionality, ranking, end user
  feedback
• DOIs used for indexing articles and linking from
  
• search results back to publisher
• Optional for CrossRef members participation
• in Pilot to be expanded in 2004

15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
Multiple Resolution

• The user makes a choice

19
Multiple Resolution

• Construction of a normal link Vs a multiple
  resolution link

Single resolution link
The
Link Text
Multiple resolution link
onic_src.js" src"http//www.crossref.org/MRServlet/MR/10.5555/
sample-doi? The20Link20Text" pt
20
Multiple Resolution

• Management of the underlying metadata

Single resolution link
DOI One URL, that being the location of the
article at the publishers site
(default format)
Multiple resolution link
DOI URL of the article at the publishers site
(default format, e.g. HTML)
URL of the article in other formats (Word,
PDF, text..) URLs of
related links (journal home page, supporting data
etc) URLs of other
locations of the article (institutional
repositories) URL of
services (rights procurement, document print ..)
21
Multiple Resolution

• How will it work?
• CrossRef will define the framework
• (menu taxonomy, policies, tools, procedures)
• Target content owners will decide what they want
  on the menus of their items (third parties must
  work with the content owner to get their
  interests included in a menu)
• Source content owners agree to use multiple
  resolution style links (the menu content is not
  controlled by the owner of the link, its
  controlled by the target of the link)

22
OpenURL and DOIs/CrossRef
OpenURL and DOI are complementary technologies

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

http//doi.crossref.org/servlet/query? id10.1006/
jmbi.2000.4282pid

• CrossRef offers an OpenURL 1.0 compliant
  resolver

http//doi.crossref.org/resolve?pid a
ulastMaas title JOURNAL OF PHYSICAL
OCEANOGRAPHY volume32issue3
spage870date2002
(This resolver will redirect you to the target
document)
23
Metadata Lessons learned

• What does linking with metadata and the
• movie The Matrix have in common?

• People Vs. the machines

• But what about standards?

• Standards do not address semantics
• Real world users can break anything!

24
IDF Metadata Interoperabilityindecs Data
Dictionary (iDD)

• CrossRef is a registration agency (one of nine
  globally)
• for the International DOI Foundation

• The IDFs mission is to promote and oversee the
  use of the
• DOI as a universal identifier (ANSI/NISO
  Z39.84-2000 )

• As an identifier the DOI is powerful because of
  the
• underlying metadata system
• A scaleable distributed registry

25
IDF Metadata Interoperabilityindecs Data
Dictionary (iDD)

• Each RA operates in specific sectors
• They have their own metadata schema

• Through policy the IDF promotes inter-RA
  operability
• Definition of a kernel metadata set common to
  any DOI
• regardless of sector applicability
• Construction of common tools (API) to access the
  registry
• Construction of a cross-schema map, the iDD

26
IDF Metadata Interoperabilityindecs Data
Dictionary (iDD)
http//www.doi.org/factsheets/DOIDataDictionaries.
html Metadata interoperability means enabling
information that originates in one context to be
used in another in as automated a way as possible

• The iDD is fully developed and is undergoing
  trials
• What does the iDD do?
• A schema is input to the iDD by mapping its
  terms to a
• structured ontology
• Metadata interoperability devices (exchange
  schemas)
• are drawn from the iDD

27
WWW.CROSSREF.ORG
Chuck Koscher Technology Director,
CrossRef ckoscher_at_CrossRef.org