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  • 1. Society for Scholarly Publishing May 28, 2003Linking Implementation Chuck Koscher Director Of TechnologyChuck Koscher - CrossRef 1
  • 2. Linking Implementation Agenda Refresher on DOIs and CrossRef CrossRef Statistics (how its going) New Linking Services OpenURL and DOIs/CrossRef Chuck Koscher - CrossRef 2
  • 3. Refresher on DOIs and CrossRef A Digital Object Identifier (DOI), is a unique string created toidentify 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 Chuck Koscher - CrossRef 3
  • 4. Refresher on DOIs and CrossRef  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 accessibleHTTP:// Chuck Koscher - CrossRef 4
  • 5. Refresher on DOIs and CrossRef  How the DOI & CrossRef Work HTTP:// Constant address DOI used to ‘lookup’ of the Resolver the entity’s URLPublisher 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 to3 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 Chuck Koscher - CrossRef 5
  • 6. Refresher on DOIs and CrossRef How Publishers use CrossRef1. 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 DOIs3. Make the reference link active by using<some-DOI>  May cache the DOIs for later use  Retrieve the DOIs as needed How Libraries use CrossRef  Directly query CrossRef (CERN is placing<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 Chuck Koscher - CrossRef 6
  • 7. 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 Chuck Koscher - CrossRef 7
  • 8. 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 Chuck Koscher - CrossRef 8
  • 9. New Linking Services  Free DOI Queries  Parameter Passing  Forward Linking  Ambiguous ResultsChuck Koscher - CrossRef 9
  • 10. Free DOI Queries Annual fee for libraries has been dropped immediately Lookup fee will be eliminated as of Jan 04 Chuck Koscher - CrossRef 10
  • 11. Parameter Passing  Allows the link source to pass information through the DOI resolver to the link target (very cool!)  Based on OpenURL 1.0 SourceHTTP:// HTTP:// With Out Parameter Passing Parameter Passing and With Parameter Passing Registered URL a standard vocabulary HTTP:// Target HTTP:// Chuck Koscher - CrossRef 11
  • 12. Forward LinkingChuck Koscher - CrossRef 12
  • 13. 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 Chuck Koscher - CrossRef 13
  • 14. 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 Chuck Koscher - CrossRef 14
  • 15. 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)<USR>:<PWD>  CrossRef offers an OpenURL 1.0 compliant resolver<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) Chuck Koscher - CrossRef 15