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

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

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

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

The Deposit

NPG Article Metadata NPG Full Text SGML

CrossRef Deposit Record

The Query

Finds References Queries CrossRef & Inserts found DOIs into NPG Refmaster

Builds Reference Sections from DOIs in NPG Refmaster

The User Experience

Article with Abstract

Article w/o abstract

Articles referred & linked in same issue!

Statistics ( ) 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

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 / /ng732 Use DOI for all inbound links to NPG products! Document Delivery Revenue is increasing Added DOI Search to nature.com

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)

Contact Howard Ratner CTO, Nature Publishing Group