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Re: First feedback on MINUS

From: Ivan Herman <ivan@w3.org>
Date: Fri, 10 Jul 2009 17:13:27 +0200
Message-ID: <4A575A97.1060101@w3.org>
To: Simon Schenk <sschenk@uni-koblenz.de>
CC: Lee Feigenbaum <lee@thefigtrees.net>, "public-rdf-dawg@w3.org" <public-rdf-dawg@w3.org>


Simon Schenk wrote:
> Am Donnerstag, den 09.07.2009, 12:08 -0400 schrieb Lee Feigenbaum:
>> Simon Schenk wrote:
>>> After some chatting with colleagues:
>>>
>>> 1) Whatever semantics we choose, the operator should not be called
>>> MINUS, as its semantics is not even roughly clear intuitively.
>>>
>>> 2) A restriction to min. 1 shared variable is not intuitive.
>> Simon, does #2 mean explicitly that your colleagues expect that
>>
>> {?a="a"} MINUS {?b="b"} = no solutions?
> 
> exactly.
> 

Interesting... I must say that I am still surprised by that 'no
solution' outcome. More than the 'restrictive' approach.

Ivan


>> Or does it mean that your colleagues are uncomfortable with the 
>> restriction from an implementation or theoretic point of view?
> 
> both. :)
> 
> Cheers,
> Simon
> 
>> Or something else?
>>
>> Lee
>>
>>> Cheers,
>>> Simon
>>>

-- 

Ivan Herman, W3C Semantic Web Activity Lead
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Received on Friday, 10 July 2009 15:14:03 GMT

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