1. c2001 Endeavor Information Systems, Inc. 1 Linking & CrossRef Harry E. Samuels Digital Library Projects Coordinator Endeavor Information Systems Inc.

2. c2001 Endeavor Information Systems, Inc. What Do We Mean By Linking? We mean linking to full-text We mean linking to extended services Why Is Linking Important? Because it makes the research process faster and more efficient Linking & CrossRef

3. c2001 Endeavor Information Systems, Inc. What Does A Linking System Do? It accepts metadata from a Source Based on the metadata and information in its database, it determines what links should be presented to the user, and it then builds and presents those links. Because the library has control over the contents of the database, the linking system should only present links that are relevant and accessible to the user. Linking & CrossRef

4. Source Database Linking System Target Database Metadata Link-To URL

5. c2001 Endeavor Information Systems, Inc. What Is OpenURL? A syntax for transporting metadata via http It looks like this: http://lfp.endinfosys.com?issn=5555- 6666&date=2001&volume=1&issue=2&spage=99 What Is A Link-To URL? Whatever syntax a target database uses It may look like this: http://www.automag.com/AAOWMagazine/2001 _aprilmay/pg18.asp Linking & CrossRef

6. Source Database Linking System Target Database OpenURL Link-To URL

7. c2001 Endeavor Information Systems, Inc. What Is In A Source Database? It could be an abstracting or indexing database like ProQuest or Web of Science or Silver Platter What Is In A Target Database? Full text as in Science Direct or Academic Press or American Mathematical Society Extended Services like: –Document Delivery sites –General interest web sites –Any service for which the system can build a URL Linking & CrossRef

8. Source Database Y Linking System Target Database Y OpenURL Link-To URL Target Database X Target Database Z Link-To URL Source Database X Source Database Z OpenURL

9. c2001 Endeavor Information Systems, Inc. What Is the DOI Handle System? Managed by International DOI Foundation (IDF) Uses Handle Technology from Corporation for National Research Initiatives (CNRI) Linking & CrossRef

10. Source Database DOI Handle System Target Database DOI Link-To URL http://dx.doi.org/http://dx.doi.org/10.1000/12345 6

11. c2001 Endeavor Information Systems, Inc. What Is CrossRef? Co-operative effort between 70 learned publishers Non-profit trade association Enables identifier-based linking using DOIs Registers DOIs and URLs for member publishers Provides metadata lookup service to enable link resolution Funded by look-up and deposit fees Linking & CrossRef

12. CrossRef Collection Service DOI Handle System Publisher Article Metadata DOIs URLs CrossRef Database Article Metadata DOIs URLs

13. CrossRef Query Service Publisher Article Metadata CrossRef Database DOIs

14. c2001 Endeavor Information Systems, Inc. What Is The Appropriate Copy Problem? The DOI Handle System has several inherent problems –It does not know if the user’s library has a linking server and does not know the information in the linking server’s database. –It only registers URLs for rights holders (publishers) and knows nothing about aggregator sites or local copy (electronic or hardcopy). Linking & CrossRef

15. c2001 Endeavor Information Systems, Inc. Appropriate Copy Prototype A prototype group led by Dale Flecker of Harvard that is testing an architecture that will put a library’s linking server back in the loop. Linking & CrossRef

16. Source Database DOI Handle System Publisher Database DOI Link-To URL Aggregator Database Local Copy Linking Server DOI in OpenURL CrossRef DOI in OpenURL Metadata Link-To URL DOI

17. c2001 Endeavor Information Systems, Inc. Endeavor Linking Products LinkFinder –Packaged with Citation Server –Accepts metadata passed to it from Citation Server interface and provides links to full-text (one-way linking) –Extended service links will also be added –Scheduled release is Summer 2001

18. c2001 Endeavor Information Systems, Inc. Endeavor Linking Products LinkFinderPlus –Packaged with ENCompass AND sold as stand-alone product –Accepts OpenURL from any interface including ENCompass –Builds link-to URLs –Will be able to serve as local resolver for appropriate copy resolution –Scheduled release is End-Of-Year 2001 (as stand-alone and packaged with ENCompass)

19. c2001 Endeavor Information Systems, Inc. Important URLs NISO Committee AX on OpenURL http://library.caltech.edu/openurl CrossRef http://www.crossref.org The Digital Object Identifier System http://www.doi.org/

20. c2001 Endeavor Information Systems, Inc. Endeavor’s ENCompass