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Uniform Resource Locator (URL), PURL.pptx

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Uniform Resource Locator (URL), PURL.pptx

  1. 1. UNIFORM RESOURCE LOCATOR (URL), PURL AND DOI DR. IRFAN UL HAQ AKHOON
  2. 2. UNIQUELY IDENTIFY THE RESOURCE There is the problem of naming, identifiers and persistence. Naming is required to uniquely identify digital objects thus it should be permanent, lasting indefinitely. These cannot be bound with specific locations. A global scheme of unique identifier is required. Three schemes proposed to get over the problems of persistent naming are PURLs, URNs, and digital object identifiers: PURLs – are persistent URLs, a scheme developed by OCLC to separate document name from its a location. URN – Uniform Resource Name have been developed by Internet Engineering Task Force (IETF). Digital Object Identifier (DOI) – Developed by Association of American Publishers and Corporation for National Research Initiatives to provide a method by which digital object can be reliably identified and DR. IRFAN UL HAQ AKHOON
  3. 3. UNIFORM RESOURCE IDENTIFIER A Uniform Resource Identifier (URI) is a unique sequence of characters that identifies a logical or physical resource used by web technologies. URIs may be used to identify anything, including real-world objects, such as people and places, concepts, or information resources such as web pages and books. Some URIs provide a means of locating and retrieving information resources on a network (either on the Internet or on another private network, such as a computer file system or an Intranet). There are two types of URIs: Uniform Resource Name (URN): Uniform Resource Locator (URL): DR. IRFAN UL HAQ AKHOON
  4. 4. TYPES OF URI DR. IRFAN UL HAQ AKHOON
  5. 5. UNIFORM RESOURCE NAME  URIs which provide only a unique name, without any means of locating or retrieving the resource or information about it, these are Uniform Resource Names (URNs).  A Uniform Resource Name (URN) is a persistent and location-independent identifier that follows the “urn” scheme.  In this context, “persistent” means that the URN persists in identifying the same resource over time. DR. IRFAN UL HAQ AKHOON
  6. 6. UNIFORM RESOURCE LOCATOR (URL) It is an address of the resource located anywhere over the web.  Uniform: Unique.  Resource: Anything that has entity  Locator: A tool that can act as a reference/address to an object that has an identity DR. IRFAN UL HAQ AKHOON
  7. 7. COMPONENT OF URL Syntax: <scheme>:<host-specific-part>:<domain> The scheme may be :  FTP :File Transfer protocol  HTTP: Hypertext Transfer Protocol  HTTPS: Hypertext Transfer Protocol Secured File: Host-specific file names Domain: region, area, specialty etc. Example: http://www.kashmiruniversity.ac.in DR. IRFAN UL HAQ AKHOON
  8. 8. PROBLEM ASSOCIATED WITH URL URL are not persistence and resource can lost, if  The server moves to a new computer  Server moves to a new port on the same computer  Name of the computer the server runs on changes  Resource's name changes  Resource moves to a new server DR. IRFAN UL HAQ AKHOON
  9. 9. PERSISTENT UNIFORM RESOURCE LOCATOR (PURL) DR. IRFAN UL HAQ AKHOON
  10. 10. PERSISTENT UNIFORM RESOURCE LOCATOR PURLs are Web addresses that act as permanent identifiers in the changing Web infrastructure. PURLs provide a level of indirection that allows the underlying Web addresses of resources to change over time without negatively affecting systems that depend on them. This capability provides continuity of references to network resources that may migrate from machine to machine for business, social or technical reasons. PURL was introduced by OCLC in 1995 and managed for over 20 years. In 2015, OCLC and the Internet Archive engaged in a cooperative effort to build a new sustainable service. All previous PURL definitions have been transferred to the Internet Archive and can continue to be maintained by their owners through a new web-based interface located at http://www.archive.org/ DR. IRFAN UL HAQ AKHOON
  11. 11. PERSISTENT URL PURL (Persistent Uniform Resource Locator) Three Component :  Protocol  Resolver address  Name DR. IRFAN UL HAQ AKHOON
  12. 12. SOME PURL SERVERS purl.org - The PURLs sites hosted at OCLC. purl.bioontology.org Bioinformatics community project hosted at the National Center for Biomedical Ontology. demo.sharedname.org - Bioinformatics community project hosted at Shared Names. purl.zepheira.com - PURL service for Zepheira and its customers. purl.access.gpo.gov - Access to US government documents via the Government Printing Office. purl.fcla.edu - PURL service of The Florida Center for Library Automation. The Callimachus Project implements PURLs as of December 2012. DR. IRFAN UL HAQ AKHOON
  13. 13. DIGITAL OBJECT IDENTIFIER (DOI) DR. IRFAN UL HAQ AKHOON
  14. 14. DIGITAL OBJECT IDENTIFIER (DOI) A DOI, is a string of numbers, letters and symbols used to permanently identify an article or document and link to it on the web. Developed by the International DOI Foundation in 2000 A DOI is a standardized system for identifying an electronic or digital object on the web. Provides a persistent identification number to each resource registered with DOI registration agencies. A DOI looks like this:  DOI: 10.1037/15575330903279630 DR. IRFAN UL HAQ AKHOON
  15. 15. USES OF DOI An identification system for intellectual property in the digital environment. DOIs are in wide use mainly to identify web resources either academic, professional or government on the web which include:  Journal articles,  Research reports,  Data sets,  Official publications, DOI is also used to identify other types of information resources, such as commercial videos, audios etc.. DR. IRFAN UL HAQ AKHOON
  16. 16. COMPONENT OF DOI DOI Prefix: Two component:  10.<organization assigned number>  1000 < the registrant> DOI Foundation DOI Suffix Identification for the entity, it may be a number, ISBN, item ID etc. DR. IRFAN UL HAQ AKHOON
  17. 17. BENEFITS OF DOI SYSTEMS Globally accepted unique identifier of electronic resources; Persistence !!! DOIs are easy to use. Provides multiple instances; Extensible namespace; International organizational support; Works under distributed service model; Works with secured name service; Part of distributed administration service; and Provides efficient resolution service. Interoperability with other data from other sources DR. IRFAN UL HAQ AKHOON

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