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The Importance of Identifiers in Resource Management and Access

Identifiers play a critical role in the management and access of various resources. They allow for unambiguous identification of resources, facilitate proper citation, and help document changes in ownership and registration as intellectual property. Effective identifiers are globally unique, persistent, and independent of specific locations. Various identification schemes, such as URNs, DOI, and ISBNs, ensure scalability and support legacy systems. Understanding and managing these identifiers is essential for reliable resource access and intellectual property rights.

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The Importance of Identifiers in Resource Management and Access

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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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