Persistent identifiers appear to solve the problem of changes in location and/or names of the files on the Internet. Its aim is to redirect the documents when their location changes (URL change).
The permanent identification of digital documents ensures the correct citation of this type of work, since its URN (Uniform Resource Name) is always the same but has undergone a change of location to another server or directory. Thus, it prevents the existence of bibliographical references that refer to broken links.
The System Handle is a system that allows the assignment of persistent identifiers to resources in existing digital information or material on the Internet (articles, reviews, images, etc.)..
Developed by CNRI (Corporation for National Research Initiatives) , is structured in two parts:
- Prefix (Prefix): identifies the manufacturer ID (university, editorial, magazine, etc.)
- Suffix (Suffix) identifies each of the documents or digital works (article, book, chapter, etc.)
The combination of the prefix and suffix forms the persistent identifier, in this case called its "handle".
To be able to quickly locate a document with a "handle" to write to the bar browser address string followed by the corresponding prefix and suffix. Pressing enter will redirect us directly to the document.
The DOI system provides a framework for persistent identification of electronic resources management of intellectual content, managing metadata, linking customers with content suppliers, facilitating electronic commerce and enable automated management of media. The system is managed by the International DOI Foundation , although the resistration is performed through Registration Agencies
Just as with the Handle system, the DOI system will not change over time , although the article is relocated to a different direction, since it takes the information entered in the form of metadata.
This system is the most widespread among commercial publishers and magazines when assigning persistent identifiers to their digital works.
Like the Handle system, the DOI is divided into two parts:
-A prefix for the DOI manufacturer.
-A suffix assigned to each document or item.
For the following example, 10.4100/jhse.2010.52.15, the first sequence number would be the prefix that identifies the producer (10.4100), and the following suffix that identifies the digital document (jhse.2010.52.15).
In order to easily resolve a DOI http://dx.doi.org/ can be written in the browser address bar followed by the corresponding prefix and suffix. Pressing intro redirect us directly to the document.
To assign a DOI must choose one of the agencies registration and request a prefix as a producer of DOI's. The prices vary depending on the agency and the number of DOI's registered.
The PURL is a uniform resource locator (URL) based on the Uniform Resource Identifier or URI, not directly describing the location of the resource to retrieve, but describes an intermediate location (more persistent) that serves as a funnel to the final appeal.
When you enter a PURL in a browser, this is responsible for sending the request to a server page, which returns a true PURL URL. PURLs are persistent because once they are established, they need not be changed ever. The actual address of a website may change but the PURL is still safe. PURLs are managed by the OCLC (Online Computer Library Center).
In order to activate a PURL, you need to sign up on this website
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