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Re: URIs and SPARQL endpoints

From: Dan Brickley <danbri@danbri.org>
Date: Mon, 19 Jun 2006 04:48:18 -0400
To: Hans Teijgeler <hans.teijgeler@quicknet.nl>
Cc: SW-forum <semantic-web@w3.org>, "Paap, Onno" <onno.paap@gmail.com>
Message-ID: <20060619084818.GC1745@postdiluvian.org>

* Hans Teijgeler <hans.teijgeler@quicknet.nl> [2006-06-19 10:24+0200]
> Hi,
>  
> When trying to use SPARQL one stumbles upon the concept of "endpoint". When
> I checked in the (Candidate) Recommendation the word endpoint is not used at
> all. Yet, when you use Google you get many deliberations about endpoints,
> but nowhere a definition or standardization. How come? Where can I find
> reading material about (SPARQL) endpoints that doesn't assume that I already
> know what it is?

Interesting point. The word I think comes from the SOAP community, but I
looked in the SOAP specs and similarly found only casual mention of it
there. Hunting further, I find it in the "normative definitions" section
of the Web Services Description Requirements doc at
http://www.w3.org/TR/ws-desc-reqs/#normDefs

[[
EndPoint (AKA Port)

    [Definition: An association between a fully-specified
    InterfaceBinding and a network address, specified by a URI [IETF RFC
    2396], that may be used to communicate with an instance of a Web
    Service. An EndPoint indicates a specific location for accessing a
    Web Service using a specific protocol and data format.]
]]

That last phrase is applicable; perhaps the entire definition
even, since the protocol uses WSDL.
>  
> I also have a direct question: what is the difference between a URI and an
> endpoint? Somewhere I read a discussion about this, but the participants in
> that discussion didn't seem to agree with each other, so it seems that I am
> not completely alone in my ignorance.

URIs are identifiers, basically names for things on the Web. Endpoints,
like many other things, can be named with URIs. There's a lot more about 
URIs in http://www.w3.org/TR/webarch/

Hope this helps,

Dan


> Can someone help me?
>  
> Regards,
> Hans
>  
> ____________________
> OntoConsult
> Hans Teijgeler
> ISO 15926 specialist
> Netherlands
> +31-72-509 2005
> HYPERLINK "http://www.infowebml.ws/"www.InfowebML.ws 
> HYPERLINK "mailto:hans.teijgeler@quicknet.nl"hans.teijgeler@quicknet.nl
>  
>  
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Received on Monday, 19 June 2006 08:48:30 UTC

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