RE: [xml-dev] URIs harmful (was RE: [xml-dev] Article: Keeping pace with James Clark)

["Joshua Allen" <joshuaa@microsoft.com>]

OK, so a URL includes DNS information and can typically be dereferenced.  Is that all?  Those two things are so important as to declare URIs a "warning flag", because they are missing those characteristics?
 
 
-----Original Message----- 
From: Thomas B. Passin [mailto:tpassin@comcast.net] 
Sent: Sat 7/20/2002 8:16 AM 
To: xml-dev@lists.xml.org 
Cc: 
Subject: Re: [xml-dev] URIs harmful (was RE: [xml-dev] Article: Keeping pace with James Clark)



	[Joshua Allen]
	
	
	> Can you clarify what you see as the disjoint between "URL" and "URI"?  To
	me, the only difference is that one depends on DNS, and the other doesn't.
	But surely you are thinking of some other issue?
	>
	
	A URI is intended to allow you to "identify"  something, and that something
	does not have to be a retrievable resource. It can be abstract.  A URL is a
	special case that gives you an identifier that does work for retrieving an
	actual resource.
	
	From rfc 2396,  "Uniform Resource Identifiers (URI): Generic Syntax":
	
	"A Uniform Resource Identifier (URI) is a compact string of characters
	   for identifying an abstract or physical resource."
	
	This is a deeper difference that just "depending on DNS", I would say.
	
	Cheers,
	
	Tom P
	
	
	
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