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Identifiers in Context

Identifiers in Context. Andy Powell UKOLN University of Bath a.powell@ukoln.ac.uk http://www.ukoln.ac.uk/.

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Identifiers in Context

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  1. Identifiers in Context Andy Powell UKOLN University of Bath a.powell@ukoln.ac.uk http://www.ukoln.ac.uk/ UKOLN is funded by the British Library Research and Innovation Centre, the Joint Information Systems Committee of the Higher Education Funding Councils, as well as by project funding from the JISC’s Electronic Libraries Programme and the European Union. UKOLN also receives support from the University of Bath where it is based. DOI Workshop, Luxembourg - 20 May 1998

  2. Overview • Issues? • Functional requirements for identifiers • Around the identifier landscape in 15 minutes! • Traditional identifiers • Identification on the Internet • How does the DOI fit into this? • Conclusions DOI Workshop, Luxembourg - 20 May 1998

  3. Issues Usage • resource discoverydiscover, locate, request, deliver • commerce - rights management • citation • in-house resource management What do we want to identify • work - version - manifestation • whole - part • digital - physical DOI Workshop, Luxembourg - 20 May 1998

  4. Issues (2) Dumb or intelligent identifiers • can the identifier be derived from the resource? Resolution • resource, metadata, order form Persistence • what happens when resource ceases to exist or is no longer commercially available? DOI Workshop, Luxembourg - 20 May 1998

  5. Functional requirements • Global scope • Globally unique • Persistent • Scalable DOI Workshop, Luxembourg - 20 May 1998

  6. Books and journals... ISBN • International Standard Book Number • Paperback/hardback can have different ISBNs ISBN 0-7475-2266-9 ISSN • International Standard Serial Number ISSN 1361-3200 DOI Workshop, Luxembourg - 20 May 1998

  7. …parts of books and journals SICI • Serial Item and Contribution Identifier • Serials, parts of serials… and fragments • NISO standard (1991 and 1996) • Submitted to ISO • Widely used • Incorporates ISSN 0730-9295(199206)11:2<168:CRFAOC>2.0.TX;2-X DOI Workshop, Luxembourg - 20 May 1998

  8. …parts of books and journals PII • Publisher Item Identifier • Scientific and Technical Information (STI) group of publishers (1995) S0165-3806(96)00403-8 BICI • Book Item and Component Identifier • Uses ISBN • Proposed NISO Z39 standard • Books, chapters and excerpts DOI Workshop, Luxembourg - 20 May 1998

  9. Other communities... ISWC • International Standard Work Code • Music industry - based on ISMN • Part of CIS, submitted to ISO SMPTE • Society for Motion Picture and TV Engineers National Bibliographic Agencies • National Bibliography Number (NBN) DOI Workshop, Luxembourg - 20 May 1998

  10. Internet - URL • Uniform Resource Locator • Locator - not true identifier! • Access protocol, site, filename http://www.ukoln.ac.uk/metadata/report.html • Consider... gopher://gopher.bath.ac.uk/00/prospectus/ http://www.bath.ac.uk/Prospectus/ • Can support some movement of resource using HTTP redirects DOI Workshop, Luxembourg - 20 May 1998

  11. HTTP Redirects Web server http://www.host1.com/something/ HTTP redirect http://www.host2.com/otherthing/ Web server DOI Workshop, Luxembourg - 20 May 1998

  12. Internet - PURL PURL database • Persistent URL • OCLC • Interim solution • Database of PURL/URL mappings purl.org Web server HTTP redirect http://purl.org/metadata/dublin_core Resource DOI Workshop, Luxembourg - 20 May 1998

  13. Internet - URN • Uniform Resource Name • IETF Working Group • Work in progress... • Syntax - RFC • URNs based on existing identifiers • Resolution protocol • HTTP and DNS • Support in browsers required urn:issn:1361-3200 urn:isbn:1-56592-262-X DOI Workshop, Luxembourg - 20 May 1998

  14. The DOI Distributed Handle database • Digital Object Identifier • Proposed by AAP, governed by IDF 10.1000/7 • Based on Handle system • Currently resolved using HTTP http://dx.doi.org/10.1000/7 dx.doi.org Web server HTTP redirect Resource DOI Workshop, Luxembourg - 20 May 1998

  15. Where does the DOI fit in? The DOI as URN? urn:doi:10.1000/7 Other identifiers in DOIs 10.1234/[ISBN]1-56592-262-X 10.3456/[SICI]0730-9295(199206)11:2<168:CRFAOC>2.0.TX;2-X DOI Workshop, Luxembourg - 20 May 1998

  16. Identifier questions... …proposed by Clifford Lynch, CNI Scope? • What? Assignment rules? • Who, when? Derivability? • How is identifier determined? Resolution? • Who? Policies? Persistence? • How long? Resource availability? DOI Workshop, Luxembourg - 20 May 1998

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