1. Multiple Resolution @ CrossRef Chuck Koscher Director of Technology Handle System Workshop 21 June 2007 Washington, DC

2. MR has been in the works for a long time -1995/99: Handle and DOI documents speak of multiple resources -2000: Appropriate copy solutions emerge -2003: CrossRef implementation discussed at IDF annual meeting -2004: CrossRef begins pilot of menu-based MR -2005: Focus shifts to interim-page MR, need for country code based MR expressed at IDF annual meeting -2006: MR pilot registers 40,000+ DOIs with interim page service -2007: Country code based MR implemented by CNRI, CrossRef adopts CNRI.RSC_LOC approach, implements production scale MR service

3. MR solution has two parts 1)Handle system data representation and resolution processes Best done collaboratively (ex. IDF) Best implemented centrally (e.g. CNRI) 2)Data management Deal with needs of a specific community (ex. CrossRef) Provide a service for these users to maintain Handle data Provide neutral intermediary services

4. CrossRef works by owners depositing XML … 200706181120 … Test Publication T27P 99999999 5 2001 33 1 Article Apr 16, 2007 11:51 Chuck Koscher (cont.) 5 9 1995 100 200 10.50505/test_200704082300 http://www.crossref.org/ Some component DOI 10.50505/test_200611161118 http://www.crossref.org/

5. MR ULRs expressed as added 5 9 1995 100 200 10.50505/test_200704082300 http://www.crossref.org/ Soil Science Society of America GeoScienceWorld http://vzj.geoscienceworld.org/cgi/content/abstract/4/2/225 Some component DOI 10.50505/test_200611161118 http://www.crossref.org/

6. MR data in Handle: pilot

7. MR data in Handle: production

8. Neutral intermediary services ? Interim page is a way-point Users decide Independent of any target hosting platform www.crossref.org/iPage

9. Interim page is template driven

10. Concerns Multiple participants with independent objectives Permissions Education (redirection confuses everyone) Merging overlapping data

11. Questions?