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</td></tr></table>Daniel K. Schneiderhttp://w.arbores.tech/w/index.php?title=URN&diff=17009&oldid=prevedutechwiki_en>WikiSysop at 08:48, 31 July 20092009-07-31T08:48:01Z<p></p>
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== Definition ==<br />
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* Uniform Resource Names (URNs) are intended to serve as persistent, location-independent, universal [[URI|resource identifiers]] (URIs).<br />
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* URNs have been formalized in the [http://www.rfc-editor.org/rfc/rfc2141.txt RFC 2141] and are also addressed in the [http://www.rfc-editor.org/rfc/rfc3986.txt RFC 3986 URI Syntax] specification.<br />
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== Examples ==<br />
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Today, most popular URNs are probably [[DOI]]s (stable URIs used by publishers of scientific articles).<br />
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Here are a few URN examples (frankly, I don't understand why the "urn" is needed here - [[User:Daniel K. Schneider|Daniel K. Schneider]]):<br />
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urn:issn:1082-9873<br />
urn:doi:10.1000/1<br />
urn:oasis:names:specification:docbook:dtd:xml:4.1.2<br />
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== URNs vs. URLs ==<br />
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As everybody knows, URLs change all the time. Web pages move and CMS/Databases are reorganized. Some of the information won't be dead but it will be moved to other places. If information is important (e.g. identification of a scientific article, URN resolvers may be able to find it again).<br />
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Example of a URI in both URL and URI form (from RFC 3986):<br />
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http://example.com:8042/over/there?name=ferret#nose<br />
\_/ \______________/\_________/ \_________/ \__/<br />
| | | | |<br />
scheme authority path query fragment<br />
| _____________________|__<br />
/ \ / \<br />
urn:example:animal:ferret:nose<br />
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== Links ==<br />
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* [http://www.doi.org/index.html DOI HomePage]<br />
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== References ==<br />
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; Standards<br />
* [http://www.rfc-editor.org/rfc/rfc2141.txt RFC2141 URN Syntax]<br />
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; Related standards<br />
* [http://www.rfc-editor.org/rfc/rfc3986.txt RFC 3986 URI Syntax]<br />
* [http://www.faqs.org/rfcs/rfc1738.html RFC 1738 - URL Syntax]<br />
* [http://www.faqs.org/rfcs/rfc2288.html RFC 2288 - Using Existing Bibliographic Identifiers as Uniform Resource Names]<br />
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; Introductory articles<br />
* Dan Connolly (2005). Untangle URIs, URLs, and URNs, Naming and the problem of persistence, IBM developerWorks article, [http://www-128.ibm.com/developerworks/xml/library/x-urlni.html HTML]<br />
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[[Category: standards]]<br />
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[[Category:Networking technologies]][[Category:web standards]]{{edutechwiki}}</div>edutechwiki_en>WikiSysop