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[Amedee Van Gasse]

On 27-02-10 10:21, Bruce MacArthur wrote:
> I did this and absolutely nothing would happen.  I also manually (and
> with GREAT care!!!) copied the URL into Konqueror and could get NOTHING
> to happen!  I notice that there is no top-level-domain name specified
> here, that there is no ".html" ((or similar), and that "apt:xxx" is a
> structure that I do not recall seeing in a URL -- but I do NOT want to
> suggest that my ignorance should be compared favorably with your
> knowledge!  Do you have any refinements or further suggestions for me?

An url has two parts, separated by a colon, like this:
PROTOCOL:RESOURCE

Protocol = set of agreements on how to interpret data.
Examples: http, ftp, file, mailto, apt, isbn...

Resource = network address of the data
The address also depends on the type of data. For web data (via http or 
ftp), you need a fully qualified domain name, a directory, and a 
filename. For other types of data you may need something totally different.

http://en.wikipedia.org/wiki/Uniform_Resource_Identifier
if you want to know more. In particular, take a look at the ISBN example