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Why identifiers?

Why identifiers?. To access resources To cite resources To unambiguously identify a resource To register it as intellectual property To record changes in ownership. How we identify objects now. http://www.library.cornell.edu/dlit/systems.htm ftp://ftp.is.co.za/rfc/rfc1808.txt

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Why identifiers?

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  1. Why identifiers? • To access resources • To cite resources • To unambiguously identify a resource • To register it as intellectual property • To record changes in ownership

  2. How we identify objects now http://www.library.cornell.edu/dlit/systems.htm ftp://ftp.is.co.za/rfc/rfc1808.txt gopher://spinaltap.micro.umn.edu/00/Weather/New%20York/Ithaca

  3. URLs http://www.library.cornell.edu/dlit/systems.htm • Service instructions for accessing an object • Oriented toward access/location vs. identification • Essentially, an address • Most likely ephemeral service, protocol machine/host name local file location

  4. Good Identifiers • Globally unique • Persistent | permanent • Even when the identified resource ceases to exist or is no longer available • Independent of location

  5. Good Identifier Schemes • Scalable • Extensible • Support for legacy schemes • ISBNs, ISSNs, etc.

  6. Uniform Resource Identifiers URL URN

  7. URNs urn:<Namespace Identifier>:<Namespace Specific String • Identifies an object • Nothing about access mechanism, little about location • Requires resolution services and registries • Indirection

  8. URNs urn:issn:0003-486X urn:dwr:myOrganizations:theirMembers

  9. Naming schemes • Handle System • cnri.dlib/june98-powell • DOI • 10.1045/october2002-hitchcock • ARK • ark://some.host/1234/98765432 • ark:1234/98765432

  10. As (potential) URNs urn:hdl:cnri.dlib/june98-powell urn:doi:10.1045/october2002-hitchcock urn:ark://some.host 1234/98765432

  11. PURLs • A persistent URL • Using indirection • Temporary solution? • Still identify a service, not an object • Not an actual “name” • Dependent on that service (HTTP)

  12. In the interim • Likely depend on proxy services for resolution to Cornell’s “doorstep” • urn:cul:... • urn:hdl:cul.rmc:... • But inside our doors? • How do we manage identifiers within Cornell and/or Cornell University Library?

  13. Identifiers and semantics • Semantic identifiers • Perhaps intelligent to people • cnri.dlib/june98-powell • Non-semantic identifiers • Not meaningful to people • 10.1045/abc123456

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