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What is the difference between URL,URI And URN?

sumanta panda
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Joined: Jun 23, 2008
Posts: 224
What is the difference between URL,URI And URN?
Kindly give an real example for this thing.
[ June 25, 2008: Message edited by: sumanta panda ]
Marcus Green
arch rival
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Joined: Sep 14, 1999
Posts: 2813
What is your current understanding of these terms?


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Raghavan Muthu
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Joined: Apr 20, 2006
Posts: 3344

Welcome to JavaRanch, sumanta panda


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sreeprasasd govindankutty
Greenhorn

Joined: Jun 05, 2008
Posts: 5
URI

A URI identifies a resource either by location, or a name, or both. More often than not, most of us use URIs that defines a location to a resource. The fact that a URI can identify a resources by both name and location has lead to a lot of the confusion in my opionion. A URI has two specializations known as URL and URN.

URN

A URI identifies a resource by name in a given namespace but not define how the resource maybe obtained. This type of URI is called a URN. You may see URNs used in XML Schema documents to define a namespace, usually using a syntax such as:

<xsd:schema xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="urn:example"

Here the targetNamespace use a URN. It defines an identifier to the namespace, but it does not define a location.

URL

A URL is a specialization of URI that defines the network location of a specific resource. Unlike a URN, the URL defines how the resource can be obtained. We use URLs every day in the form of http:sun.com, etc. But a URL doesn�t have to be an HTTP URL, it can be ftp://sun.com, smb://sun.com, etc.


Sreeprasad,<br />SCJP
Juwonlo Ibigbami
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Joined: Nov 03, 2006
Posts: 83
Thanks, sreeprasasd, I thought I knew it but I got to know it more explicitly.
 
 
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