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Re: Introduction to URIs

From: Henry S. Thompson <ht@inf.ed.ac.uk>
Date: Tue, 27 Jan 2009 09:05:13 +0000
To: "Roy T. Fielding" <fielding@gbiv.com>
Cc: W3C TAG <www-tag@w3.org>
Message-ID: <f5bskn5azli.fsf@hildegard.inf.ed.ac.uk>

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Roy T. Fielding writes:

>>>> From: Henry S. Thompson
>>>> . . . .
>>>>    _What's a URI and why does it matter?_
>>>>      http://www.ltg.ed.ac.uk/~ht/WhatAreURIs/
>>>>
>>>> Feedback welcome,
>
> Hmm, that reminds me ...
>
>   'Representation' names a pair: a character sequence and a media type.
>
> That's too simplified.  A representation is some amount of data and its
> associated metadata that represents the state of some resource at a
> given
> point in time [which resource and which point in time is usually
> indicated
> outside the representation; e.g., in request method semantics, response
> message status, and message metadata like the Date header field in
> HTTP].
> The media type is only one of many metadata, and there certainly is no
> requirement that the data be a "character sequence".  For example, a
> JPEG picture of my dog is not a character sequence.

Thanks, I should look at this again.  Simplified, certainly.  'Too'
simplified?  Maybe -- I'll have to see whether I think I can change
this to "byte sequence and metadata" and fill in the steps from there
without dropping below the level of detail I have informally tried to
keep to in this intended-to-be-moderately-lightweight (but not
intended to be misleading, either) document.

ht
- -- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
                         Half-time member of W3C Team
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 651-1426, e-mail: ht@inf.ed.ac.uk
                       URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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Received on Tuesday, 27 January 2009 09:05:57 GMT

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