1. NPG Case Study: CrossRef Implementation Howard Ratner CTO, Nature Publishing Group February 2002

2. NPG Publishing Program NPG: Nature Journals Division (14) Nature Magazine (Weekly) Nature Research Journals Nature Reviews Journals NPG: Specialist Journals Division (28) Oncogene, British Dental Journal, Cancer Gene Therapy, etc. NPG: Reference Division (3+) Encyclopedia of Life Sciences Encyclopedia of Astrophysics

3. Timeline Winter 1998Helps found CrossRef Spring 2000 Begins reference linking programming/testing December 2000Deposits/queries/posts/links - nature only January 2001Deposits/queries/posts/links - all nature-branded journals March 2001 Queries/posts links - EAA & ELS reference products July 2001Launches Advance Online Publication (AOP) Program January 2002 Deposits/queries/posts/links - Specialist Journals

4. Reference Linking Program The Deposit Issue-based AOP-based The Query Initial Posting Updates The User Experience

5. The Deposit

6. NPG Article Metadata NPG Full Text SGML

7. CrossRef Deposit Record

10. The Query

12. Finds References Queries CrossRef & Inserts found DOIs into NPG Refmaster

14. Builds Reference Sections from DOIs in NPG Refmaster

15. The User Experience

17. Article with Abstract

18. Article w/o abstract

19. Articles referred & linked in same issue!

21. Statistics (22.02.02) 61,536 unique DOI Article links found out of total 252,474 unique references (24% match rate) 87,179 total DOI links on site 31 journals deposited in CR MDDB 25,567 records deposited in CR MDDB

22. Experiences Problems linking from NPG products to Nature Research titles NPG journal short titles differed from Medline syntax used by CrossRef Created pre-query filter. Transforms NPG short titles to Medline syntax for query – problem solved! AOP DOI registration was too slow via CrossRef Created end-run process to Handle Server Changing NPG DOI syntax from completely dumb to internally logical 10.1038/80132 10.1038/ng732 Use DOI for all inbound links to NPG products! Document Delivery Revenue is increasing Added DOI Search to nature.com

23. Plans Nature Science Update articles to be deposited and have ref queries built Inbound links to ELS/EAA – testing now Further automate process with Content Management System (CMS)

24. Contact Howard Ratner CTO, Nature Publishing Group h.ratner@natureny.com www.nature.com