17.06.2004 epicur kathrin schroeder erpanet-workshop „persistent identifiers“ (17th june 2004)...
TRANSCRIPT
17.06.2004
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Kathrin Schroeder
ERPANET-Workshop „Persistent Identifiers“
(17th June 2004)
Uniform Resource Names (URN) –
Overview
Die Deutsche Bibliothek
Kathrin Schroeder
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● Naming Schemes and Namespaces (Identification)
– Uniform Resource Identifiers (URI), Uniform Resource Locators (URL)
– Uniform Resource Names (URN)
– further Persistent Identifiers
– XML namespaces
– ...
● Resolution of names (Resolution mechanims)
– HTTP (Redirect etc.)
– DNS (Domain Name System)
– ...
● Standardisation / Social Infrastructure
Starting Point: Naming Schemes / Namespaces and Resolution
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Terminology – the „Classical view“
URI - Uniform
Resource Identifier
URN - Uniform
Resource Name
URL - Uniform
Resource Locator
URC - Uniform
Resource Characteristic
Identification of an abstract or physical resource
Persistent naming of resources.
RFC 2396
-Identification of a resource
- Provision a means of locating the resource by describing its primary access mechanism
Characteristics of a resource e.g. meta information
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Report from the Joint W3C/IETF Planning Interest Group
- RFC 3305
Motivation: - Confusion in the web community over the partitioning of URI space, specifically, the relationship among the concepts of URL, URN, and URI.
Recommendations: -The importance of this additional level of hierarchy seemed to be lessen. -The W3C and IETF should jointly develop and endorse a model for URIs, URLs, and URNs consistent with the „Contemporary View“.- Generalized registration procedures for all URI schemes[...]
<http://www.ietf.org/rfc/rfc3305.txt>
Terminology – the „Contemporary view“
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Registered URI-Schemes
Scheme Name Description Reference-------------------- ----------------------------------------- ----------------
urn Uniform Resource Names [RFC2141] (please see: http://www.iana.org/assignments/urn-namespaces)
ftp File Transfer Protocol [RFC1738]http Hypertext Transfer Protocol [RFC2616]
[... more than 40 URI SCHEMES]
http://www.iana.org/assignments/uri-schemes (last updated 2004-01-26)
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URN-Framework
Request for Comments (RFC)
URN Syntax
Resolution
Registration of NIDs
Functional Requirements for
URNs
2141
1737
3406, 2611, 2288, 3188,
3187...
3401-3406
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URN – Syntax (RFC 2141)
<URN>::=„URN“:“<NID>“:“<NISS>
URN: resolution routineNID: namespace identifier e.g. ISBN, ISSN und NBN NISS: namespace specific string
Example: urn:nbn:de:gbv:089-3321752945
<http://www.ietf.org/rfc/2141.txt>
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URN-Framework
Request for Comments (RFC)
URN Syntax
Resolution
Registration of NIDs
Functional Requirements for
URNs
2141
1737
3406, 2611, 2288, 3188,
3187...
3401-3406
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Functional Requirements
• Global scope • Global uniqueness • Persistence • Scalability • Legacy support • Extensibility • Independence • Resolution
Requirements for Encoding Implications
Functional Requirements for URNs (RFC 1737)
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URN-Framework
Request for Comments (RFC)
URN Syntax
Resolution
Registration of NIDs
Functional Requirements for
URNs
2141
1737
3406, 2611, 2288, 3188,
3187...
3401-3406
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Namespace Definition and Registration (RFC 3406)
Assumptions- Assignment of a URN is a managed process.- The space of URN namespaces is managed.
Templates for URN-namespace registration: - Experimental Namespaces- Informal Namespaces - Formal Namespaces
Considerations include: - URN assignment procedures - URN resolution/delegation - Type of resources to be identified - Type of services to be supported - Community considerations
Review by mailing-list [email protected]
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● RFC 2648: A URN Namespace for IETF Documentsurn:ietf:rfc:2141
● RFC 3044: Using The ISSN (International Serial Standard Number) as URN (Uniform Resource Names) within an ISSN-URN Namespace urn:ISSN:0259-000X
● RFC 3188:Using National Bibliography Numbers as Uniform Resource Namesurn:nbn:fi-fe19981001
[... 21 Namespaces]
<http://www.iana.org/assignments/urn-namespaces>
Examples of registered URN-Namespaces
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URN-Framework
Request for Comments (RFC)
URN Syntax
Resolution
Registration of NIDs
Functional Requirements for
URNs
2141
1737
3406, 2611, 2288, 3188,
3187...
3401-3406
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Dynamical Delegation to URN services via DNS (RFC 3401 - 3404)
urn.arpa (Top Level)
nbn ietf
de
URN-REQUEST
urn:ietf:..
urn:nbn:...
[...]
ch fi hu
19 ...
se...
Examples „[email protected]“:
VeriSign „pin“
Voice over IP (ENUM)
au
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The client (Browser) perspective …
Plugins (Example)
http://www.persistent-identifier.de/?link=550
Other technical solutions exist ...
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Discussion points
Steady browser implementation of PIs/URNs
Development of a PI independent browser-plugin
Continuing the co-operation between IANA/IETF/W3C
Interfaces between several PI-Resolution mechanisms
And the Future ?
Thank you!