Question Re: difference between urn and url in Technology Q&A

difference between urn and url

Former Member — Wed, 14 Feb 2007 02:08:54 GMT

what's the difference between urn and url?

Re: difference between urn and url

Former Member — Wed, 14 Feb 2007 02:10:03 GMT

The namespace could be any string that uniquely defines the scope of those determined fields of the XML file. Usually, you use a URI to define that unique string, and since URLs are the most common URIs, people tend to use plain http URLs as the namespace (it doesn't need to be a valid url). But using "urn:test" for example isn't wrong.

From the specification:

URI

URI = Uniform Resource Identifier

There are two types of URIs: URLs and URNs

URL

URL = Uniform Resource Locator

<protocol>:// <host> [:<port>] [<path> [? <query>]]

URN

URN = Uniform Resource Name.

URNs define XML schemas.

urn:<namespace>:<string>

Re: difference between urn and url

Former Member — Wed, 14 Feb 2007 02:12:42 GMT

Hi,

URN: Uniform Resource Name

urn:sap-com:xi:demo (URI with out protocol assignment)

URL: Uniform Resource Locator

http://sap.com/xi

Award points if helpful.

Re: difference between urn and url

Former Member — Wed, 14 Feb 2007 05:11:30 GMT

Hi Kalpana,

Please go through these two threads. It will resolve your query:

Regards,

Subhasha

Re: difference between urn and url

prasanthi_chavala — Fri, 16 Feb 2007 04:29:12 GMT

Hi Kalpana,

>> URI (Uniform resource Identifier) is same as URL(Uniform resource locator) but it is not necessarily point to web resource.

>>URN is same as URI but dont have protocol assignment.

Cheers,

prasanthi.

Re: difference between urn and url

Former Member — Fri, 16 Feb 2007 04:37:39 GMT

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-d8e704f88817

Regards

Chilla..

Re: difference between urn and url

Former Member — Fri, 16 Feb 2007 04:52:34 GMT

What is an URL

An Uniform Resource Locator (URL) is the term used to identify an Internet resource, and can be specified in a single line of text.

What is an URN

An Uniform Resource Name (URN) is the term used to identify an Internet resource, without the use of a scheme, and can be specified in a single line of text.

What is an URI

An Uniform Resource Identifier (URI) is used by a browser to identify a single document, and it too can be specified in a single line of text

The general form of an URL has four parts

A scheme followed by a colon.

Invokes a TCP/IP-based application level protocol

Schemes are: http, https, ftp, news, mailto, file, telnet.

A server name.

A // followed by the host name or IP address of the server

Not needed if the server is the default

news server

mail server

An optional port number. Standard or default port numbers are:

ftp *

ssh 22

telnet 23

smtp 25

gopher 70

http 80

nntp 119

SSL 443

A path.

Consisting of folders and/or files.

May include a file extension which identifies the type of document.

May also include a QUERY_STRING with arguments.

Ftp uses port 20 for data and port 21 for flow control.

DIFFERENCE BETWEEN URN & URI

The idea is that a 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:90-365-17273

URI: is a string that identifies any resource. Indentifying the resource does not necessarily mean we can retrieve it. URI is a superset of URL and URN.

files/reports/marketing/report.html

URL: URI that specify a common Internet protocol such as HTTP or FTP are also called URLs. URL is an informal term an is not used in technical specifications.

http://www.foo.com/files/reports/marketing/report.html

URN: A URN is an identifier the uniquely indentifies a resource but does not specify how to access that resource.

ISBN: 1-930110-59-6

I hope it helps

Best Regards

Re: difference between urn and url

Former Member — Mon, 09 Jun 2008 05:00:49 GMT

What is an URL

An Uniform Resource Locator (URL) is the term used to identify an Internet resource, and can be specified in a single line of text.

What is an URN

An Uniform Resource Name (URN) is the term used to identify an Internet resource, without the use of a scheme, and can be specified in a single line of text.

What is an URI

An Uniform Resource Identifier (URI) is used by a browser to identify a single document, and it too can be specified in a single line of text

The general form of an URL has four parts

A scheme followed by a colon.

Invokes a TCP/IP-based application level protocol

Schemes are: http, https, ftp, news, mailto, file, telnet.

A server name.

A // followed by the host name or IP address of the server

Not needed if the server is the default

news server

mail server

An optional port number. Standard or default port numbers are:

ftp *

ssh 22

telnet 23

smtp 25

gopher 70

http 80

nntp 119

SSL 443

A path.

Consisting of folders and/or files.

May include a file extension which identifies the type of document.

May also include a QUERY_STRING with arguments.

Ftp uses port 20 for data and port 21 for flow control.

DIFFERENCE BETWEEN URN & URI

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:90-365-17273

URI: is a string that identifies any resource. Indentifying the resource does not necessarily mean we can retrieve it. URI is a superset of URL and URN.

files/reports/marketing/report.html

URL: URI that specify a common Internet protocol such as HTTP or FTP are also called URLs. URL is an informal term an is not used in technical specifications.

http://www.foo.com/files/reports/marketing/report.html

URN: A URN is an identifier the uniquely indentifies a resource but does not specify how to access that resource.

ISBN: 1-930110-59-6

I hope it helps

Best Regards

chandrakanth

Re: difference between urn and url

Former Member — Mon, 09 Jun 2008 05:08:00 GMT

HI,

From the specification:

URI

URI = Uniform Resource Identifier

There are two types of URIs: URLs and URNs

URL

URL = Uniform Resource Locator

URN

URN = Uniform Resource Name.

URNs define XML schemas.

urn:<namespace>:<string>

URL: URI that specify a common Internet protocol such as HTTP or FTP are also called URLs. URL is an informal term an is not used in technical specifications.

http://www.foo.com/files/reports/marketing/report.html

URN: A URN is an identifier the uniquely indentifies a resource but does not specify how to access that resource.

ISBN: 1-930110-59-6

Where we use this

This is used in XI as a way to group your developments. Each Software Component Version can have several namespaces. These namespaces can be of the format

http://sap.com/namespace1

urn:sap.com.namespace2

This allows you to give objects the same names if they are in different namespaces as they can still be differentiated.

Also all development objects must belong to a specific namespace.

Please reward points if it helps

Please reward points if it helps

Thanks

Vikranth