Resource Identification- A first step to gain access.
-Book: ISBN, UPC
Similar Identification system also require for the
URL(Uniform Resource Locator)
It is an address of the resource located anywhere over
Resource: Anything that has entity
Identifier: An object that can act as a reference to
something that has an identity
Component of URl
The scheme may be :
ftp :File Transfer protocol
http: Hypertext Transfer Protocol
https: Hypertext Transfer Protocol Secured
mailto: Electronic mail address
telnet :Reference to interactive sessions
File: Host-specific file names
Problem Associated with URL
URL are not persistence and resource can lost, if
the server moves to a new computer
the server moves to a new port on the same computer
the name of the computer the server runs on changes
the resource's name changes
the resource moves to a new server
A permanent URL which persistence.
There are many solutions : PURL, Handle System, DOI
We shall cover the PURL and DOI in detail.
PURL(Persistent Uniform Resource Locator)
A project by OCLC
Three Component :
Digital Object Identifier
An identification system for intellectual property in
the digital environment.
Developed by the DOI foundation to provide a
framework for managing intellectual content, link
customers with publisher.
Provides a persistent identification number to each
resource registered with DOI registration agencies.
Component of DOI DOI Prefix:
Two component: 10.<organization assigned number>
Identification for the entity, it may be a number, ISBN etc.
Ensures persistence by resolving the DOI to a current
associated value such as a URL;
Resolution may be :
Benefits of DOI Systems
Persistence, persistence, persistence!!!
DOIs are easy to use. Simply click one or cut and paste
it like you would a URL
Called the “barcode for intellectual property”
Multiple resolution capability leads to more options