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Re: Turtle - Terse RDF Triple Language updated

From: Ivan Herman <ivan@w3.org>
Date: Sat, 06 Oct 2007 13:32:42 +0200
Message-ID: <4707725A.4010505@w3.org>
To: Harry Halpin <hhalpin@ibiblio.org>
CC: Alan Ruttenberg <alanruttenberg@gmail.com>, Story Henry <henry.story@bblfish.net>, Dave Beckett <dave@dajobe.org>, Michael Schneider <schneid@fzi.de>, semantic-web@w3.org


Harry Halpin wrote:
> Ivan Herman wrote:
>> Alan Ruttenberg wrote:
>>   
>>> On Oct 5, 2007, at 3:05 PM, Tim Berners-Lee wrote:
>>>
>>>     
>>>> :Joe   :aunt [ is :Sally;   age 78 ].
>>>>       
>>> Does this generate 2 or 3 triples? 
>>>     
>> At present, this generates three triples using a blank node.
>>
>>   
>>>                                     Henry's note suggests that it should
>>> generate 2, as he is using the notation as shorthand. 
>>> In other words, parsing this should not generate any blank nodes.
>>> I would support that interpretation, which I think would need to be
>>> documented.
>>> It would be a shame to generate bnodes as a consequence of solely
>>> wanting an abbreviation.
>>>     
>> If we change this interpretation we would get ourselves into a major
>> incompatibility with SPARQL. That makes me nervous.
>>   
> I mean, I'm pretty sure that generates 3 triples in N3 [1], so N3/Turtle
> is consistent with SPARQL
> 

Exactly. Ie, I can copy paste this Turtle code to a SPARQL expression
and vice versa and it means the same thing. Alan's proposal would break
that, and _that_ makes me nervous (without any coffee:-)...


[snip]

> 
> Regardless, as for features like "=" - yes, of course they are useful.
> However, I think the obvious thing to do is to keep Turtle and N3 syntax
> separate, with N3 syntax being a superset of Turtle. So, keep Turtle 1
> to 1 with SPARQL, and then have N3 have things like "=" in it.
> 
> However, the first hurdle is clearly getting Turtle stable, which it (at
> least to me) seems more or less.
>

+1

Ivan

> [1] http://www.w3.org/2000/10/swap/Primer
> [2] http://www.w3.org/TR/rdf-sparql-query/
>> Ivan
>>
>>
>>   
>>> -Alan
>>>
>>> On Oct 3, 2007, at 10:36 AM, Story Henry wrote:
>>>
>>>     
>>>> :me foaf:knows [ owl:sameAs <http://www.w3.org/People/Connolly/#me>;
>>>>
>>>>                  a foaf:Person;
>>>>
>>>>                  foaf:name "Dan Connolly" ] .
>>>>
>>>>
>>>> That saves me having to look around the file for the info, and it also
>>>> save me having to type a URL twice, which is more likely to cause a bug.
>>>>
>>>>
>>>> If I don't do that I would have to write
>>>>
>>>>
>>>> :me foaf:knows <http://www.w3.org/People/Connolly/#me>.
>>>>
>>>> <http://www.w3.org/People/Connolly/#me> a foaf:Person;
>>>>
>>>>                                         foaf:name "Dan Connolly"  .
>>>>
>>>>       
>>   
> 
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
Home: http://www.w3.org/People/Ivan/
PGP Key: http://www.ivan-herman.net/pgpkey.html
FOAF: http://www.ivan-herman.net/foaf.rdf

Received on Saturday, 6 October 2007 11:33:06 GMT

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