diff b/n

[Former Member]

wat is the diff b/n URN,URL,URI?

[Former Member · Accepted solution]

HI,

Uniform Resource Identifier (URI)

It addresses a resource in the Internet in the following way:

By name

This is called Uniform Resource Name (URN).

By location,

This is called Uniform Resource Locator (URL).

Uniform Resource Locator (URL)

It addresses a resource in the Internet. The URL is the address you enter into the address

field of your browser. The URL syntax describes a subset of the Uniform Resource Identifier

syntax.

It addresses a resource in the Internet, regardless of its location. The URN syntax follows the

rules of the URI. A URN can also be used to define distinct entities without being associated

to an existing resource. The name spaces in the portal make use of this feature. A URN has

the prefix: urn://. For further information about the syntax, see the description for RFC

2141 at www.ietf.org.

Please see below links

http://www.xfront.com/URLversusURN.pdf

http://help.sap.com/saphelp_nw04/helpdata/en/e2/74e493cee04a168a163472c696c8e7/frameset.htm

https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/8a41cee4-0601-0010-5fb3-d8e704f8...

you use URI i.e. http://<name> when you wish to export your namespaces over the web.

This link will help you understand the concept in a much better manner:

http://help.sap.com/saphelp_nw04/helpdata/en/4a/0ba9409ecd1314e10000000a1550b0/frameset.htm

Also Please go through this link:

http://help.sap.com/saphelp_nw04/helpdata/en/d8/d666580fff294f884df148540b2153/frameset.htm

and,

http://help.sap.com/saphelp_nw04/helpdata/en/a3/cc132914cf41e4a193c32627a87542/frameset.htm

Regards

Chilla

[Former Member]

URL is a mechanical link to a resource's location, where it can be downloaded. For this reason, a URL contains a hostname and a local part, all of which can be resolved anywhere on the Internet.

What a URN tries to do is different. It tries to give a description of a resource without actually pointing at it. For example:

urn:isbn:67-123-12345

This is the URN for my PhD thesis, but it does not give you a clue where you could get it. Probably you need resolution software to come to that. The word isbn is a so-called URN-space, and it has been registered formally. There are also non-global URN spaces, they start with an x- prefix.

URI is merely the possibly overlapping union of strings that are a URL or a URN.

URI stands for Universal Resource Identifier and URL stands for Universal Resource Locator. Often times people use the terms interchangably, which is not entirely correct. A URL is a subset of the URI popular protocols. These are protocols (http://, ftp://, mailto:). Therefore all URLs are URIs. The term URL is deprecated and the more correct term URI is used in technical documentation. All URIs are means to access a resource on the Internet and are a a technical short hand used to link to the resource. URIs always designate a method to access the resource and designate the specific resource to be accessed.

To see more trusted information ...see this IBM published doc:

http://www-128.ibm.com/developerworks/xml/library/x-urlni.html

[MichalKrawczyk]

Hi,

just check this one link:

http://en.wikipedia.org/wiki/Uniform_Resource_Name

and you will have an answer to all three:)

Regards,

michal