It may be based on an existing standard identification scheme, for example a Serial Item and Contribution Identifier (SICI)  or Publisher Item Identifier (PII) , or it may be based on some proprietary in-house scheme. The experimental system described in this article shows that the use of a Web cache such as Squid may be one method of deploying URNs without the need to integrate support for URN resolution protocols into every Web browser. The second identifies an article entitled "Developmental expression of a DNA repair gene in Arabidopsis" published in an Elsevier Science journal. The script returns a list of mirror sites for the Apache HTTP server project. At the time of writing, only Netscape Navigator version 4 appears to offer the appropriate support to allow URN resolution in this way. Squid connects to the N2L CGI script running on the doi machine, which in turn connects to a Handle server using the hdlres command. In certain circumstances, we offer institutions and publishers the option to manage their own subnamespace in the namespace urn:nbn:de and to register URNs in it. It can be queried directly using a URL of the form: The hdlres command is a very simple Handle resolver. (The /etc/hosts file is one of the methods used by UNIX machines to resolve host names). The DOI System  is an identification system for digital media developed originally by the Association of American Publishers (AAP) in collaboration with the Corporation for National Research Initiatives (CNRI); it is now governed by The International DOI Foundation. Currently hdlres does very little checking of the DOI (or Handle) that it is given to resolve or of the results returned from the Handle system. The second and third problems may be solved with a change to the way in which URNs are resolved by Squid. In other words, Squid connects to a CGI script, /uri-res/N2L, on the host named by fqdn to obtain a list of URLs for url-path. In the case of an error or a failed DOI lookup, N2L returns zero URLs in which case Squid returns an HTML error message to the Web browser. Get detailed technical information on resolver behaviour (only available in German): All online publications archived by the German National Library are assigned an URN from the namespace "urn:nbn:de". However Squid can be fooled into thinking that doi is a valid host name by adding an entry for doi into the /etc/hosts file on the machine on which it is running. The first part indicates the Directory Manager who has assigned the DOI and is currently always "10". URNs ensure that online resources will remain available in the long term.
If you are interested, please send an e-mail to firstname.lastname@example.org.
The prefix is '10.1000' and the suffix is "1". Indeed, the example N2L script available from UKOLN has already been extended to support the IETF URN namespace . Resolving DOI Based URNs Using Squid Firstly, repeated accesses to the same resource cause the DOI to be resolved each time. Short-URL: Some ideas on the areas that might be investigated in the future are outlined below.
There are three related problems with this approach. More than 42 million URNs were registered in the namespace urn:nbn:de by the end of 2019. An Experimental System at UKOLN. The descriptions in the Xepicur documentation in the Wiki will be the only valid ones once this occurs. Notice also that, by comparing the first two components of the URN (e.g., by checking for "urn:doi: " rather than simply 'urn:'), it would be possible to use different proxy servers to resolve different URN namespaces. XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable); nsmgr.AddNamespace("bk", "urn:samples"); //Select and display the value of all the ISBN attributes. URNs ensure that online resources will remain available in the long term. The cached resource is associated with it's URL, not with it's URN. The URN and the more familiar URL together make up the set of resource identifiers known as Uniform Resource Identifiers (URIs) that are used to identify and locate information on the Web. The prefix is assigned by the Directory Manager.
For example, the ISSN for D-Lib Magazine could be used as the basis for the following URN: Although RFC-2288 doesn't cover DOIs, it seems reasonable to infer from it that they will be encoded as URNs in the following way: One of the impediments to the experimental deployment of URNs is the lack of support for URN resolution protocols in mainstream Web browsers. In such a system, subsequent requests for the same URN might be satisfied by using the cached copy of the resource directly. https://www.dnb.de/EN/urnservice Of … A Simpler Method for Resolving Alert-Info URNs, Worley Informational [Page 1], Worley Informational [Page 2], Worley Informational [Page 3], Worley Informational [Page 4], Worley Informational [Page 5], Worley Informational [Page 6], Worley Informational [Page 7], Worley Informational [Page 8], Worley Informational [Page 9], Worley Informational [Page 10], Worley Informational [Page 11], Worley Informational [Page 12], Worley Informational [Page 13], Worley Informational [Page 14], Worley Informational [Page 15], Worley Informational [Page 16], Worley Informational [Page 17], Worley Informational [Page 18], Worley Informational [Page 19], Worley Informational [Page 20], Worley Informational [Page 21], Worley Informational [Page 22], Worley Informational [Page 23], Worley Informational [Page 24], Worley Informational [Page 25], Worley Informational [Page 26], Worley Informational [Page 27], Worley Informational [Page 28], Worley Informational [Page 29], Worley Informational [Page 30], Worley Informational [Page 31], Worley Informational [Page 32], Worley Informational [Page 33], Worley Informational [Page 34], Worley Informational [Page 35], Worley Informational [Page 36], Worley Informational [Page 37], Worley Informational [Page 38], Worley Informational [Page 39], Worley Informational [Page 40], Worley Informational [Page 41], Worley Informational [Page 42], Worley Informational [Page 43], Worley Informational [Page 44], https://www.iso.org/iso-3166-country-codes.html, ietf-drafts/worley/draft-worley-alert-info-fsm.aux.
URN registries. Finally, the system described here is not limited to DOI based URNs. Secondly, the Web browser has no knowledge of the URN used to identify the resource after it has been retrieved. a new OAI harvester was implemented while modernising the technical infrastructure of the URN service and will successively take over all URN harvesting. Squid is a public domain caching proxy Web server that is widely used throughout the Internet community. DOIs and their associated URLs are held in the DOI Directory, a distributed database based on the Handle System. The URN service is helpful if large numbers of URLs have to be deleted. Example for URN
The experimental system described here uses the second of these protocols to allow Squid to resolve DOI based URNs. The IETF URN Working Group  is currently defining a persistent identifier for information resources known as the Uniform Resource Name (URN). The machine associated with the doi name must be running an N2L CGI script that can resolve DOIs. This means we are responsible for the long-term archiving of digital publications, a task which includes persistent identification through the assignment of URNs. The amendment to the Law Regarding the German National Library in 2006 extended our collection mandate to encompass online publications. Assuming that the DOI is valid, the Handle system returns the URL associated with the DOI and Squid uses this as the basis for an HTTP redirect sent back to the end user's Web browser. Rather than returning an HTTP redirect to the browser, it may be possible for Squid to resolve the URN, retrieve the resource, cache it (such that the cached resource is associated with the URN) and finally return the resource directly to the browser. The HTTP proxy can be configured manually using the "Edit", "Preferences" menu.
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