W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > January 2002

Re: TAG issues during technical plenary

From: Pat Hayes <phayes@ai.uwf.edu>
Date: Wed, 23 Jan 2002 15:18:25 -0600
Message-Id: <p05101003b874d72c4b7d@[65.212.118.208]>
To: Patrick Stickler <patrick.stickler@nokia.com>
Cc: w3c-rdfcore-wg@w3.org
>On 2002-01-23 12:45, "ext Graham Klyne" <Graham.Klyne@MIMEsweeper.com>
>wrote:
>
>>  ...
>>  roughly, a URI denotes a function that, when applied to some arguments,
>>  returns some data entity...
>
>That's an interesting way to look at it, and in fact, a
>useful analogy for the difference between URL/URN/URP
>is that a URL is a function, a URN is a pointer to a
>function

Why to a function? Wouldnt a URN be able to name almost anything?

>(possibly null) and a URP is a constant.
>
>Hmmm...

Let me add another thought. Some URIs may be best thought of as 
continuations, so that when invoked (called) they return a data 
entity but also (perhaps implicitly) another way to call the same 
function; and that next call may return a different data entity, of 
course. This lets the 'resource' (?) have some residual state which 
may change with time, rather than being a pure mathematical function, 
and therefore gives some flesh to the otherwise puzzling talk about 
'conceptual mapping' in RFC2396.

Just a thought to keep y'all humming.

Pat

PS heres another thought. DAML is going through the throes of 
inventing a query language for itself. Is there any basic similarity 
between using a URI to access something, and posting a query and 
getting back an answer? Maybe a URI is a kind of generic atomic 
'query' addressed to the web as a whole, along the lines of 'does 
anything with this name exist?'

I have no idea if this makes any sense at all, but if it causes 
someone to have an epiphany, please remember me in your will.

Pat


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Received on Wednesday, 23 January 2002 16:18:18 EST

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