What is URI?

1.	What is URI?
Answer» Uniform Resource Identifier is the full form of URI which is used for identifying each resource of the REST architecture. URI is of the format: <PROTOCOL>://<service-name>/<ResourceType>/<ResourceID> There are 2 TYPES of URI: URN: Uniform Resource Name identifies the resource by means of a name that is both unique and persistent. URN doesn’t always specify where to locate the resource on the internet. They are used as templates that are used by other parsers to identify the resource. These FOLLOW the urn SCHEME and usually prefixed with urn:. Examples include urn:isbn:1234567890 is used for identification of book based on the ISBN number in a library application. urn:mpeg:mpeg7:schema:2001 is the default namespace rules for metadata of MPEG-7 video. Whenever a URN identifies a document, they are easily translated into a URL by using “resolver” after which the document can be downloaded. URL: Uniform Resource LOCATOR has the information regarding fetching of a resource from its location. Examples include: http://abc.com/samplePage.html ftp://sampleServer.com/sampleFile.zip file:///home/interviewbit/sampleFile.txt URLs start with a protocol (like ftp, http etc) and they have the information of the network hostname (sampleServer.com) and the path to the document(/samplePage.html). It can also have query parameters.

Answer»

Uniform Resource Identifier is the full form of URI which is used for identifying each resource of the REST architecture. URI is of the format:

There are 2 TYPES of URI:

URN: Uniform Resource Name identifies the resource by means of a name that is both unique and persistent.
- URN doesn’t always specify where to locate the resource on the internet. They are used as templates that are used by other parsers to identify the resource.
- These FOLLOW the urn SCHEME and usually prefixed with urn:. Examples include
  - urn:isbn:1234567890 is used for identification of book based on the ISBN number in a library application.
  - urn:mpeg:mpeg7:schema:2001 is the default namespace rules for metadata of MPEG-7 video.
- Whenever a URN identifies a document, they are easily translated into a URL by using “resolver” after which the document can be downloaded.
URL: Uniform Resource LOCATOR has the information regarding fetching of a resource from its location.
- Examples include:
  - http://abc.com/samplePage.html
  - ftp://sampleServer.com/sampleFile.zip
  - file:///home/interviewbit/sampleFile.txt
- URLs start with a protocol (like ftp, http etc) and they have the information of the network hostname (sampleServer.com) and the path to the document(/samplePage.html). It can also have query parameters.

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