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Re: TriG being disjoint from Turtle

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Sat, 18 May 2013 11:29:42 +0100
Message-ID: <51975816.7010905@epimorphics.com>
To: public-rdf-comments@w3.org


On 17/05/13 12:50, Eric Prud'hommeaux wrote:
> * Sandro Hawke <sandro@w3.org> [2013-05-17 07:38-0400]
>> On 05/17/2013 06:00 AM, Jan Wielemaker wrote:
>>> On 05/17/2013 11:49 AM, Andy Seaborne wrote:
>>>
>>> [this fragment is from Charles Greer, not answered by Andy]
>>>
>>>> 1.  Could the spec be modified to allow TriG to be a superset of
>>>> turtle?  Specifically, could the production rules be modified to allow
>>>> a set of triples outside of any '{'  '}' to be the same as triples in a
>>>> default anonymous graph?  It seems that even now, the rules allow
>>>> multiple anonymous graph productions, whose union would be the unnamed
>>>> graph.  It would be convenient if we could dispense with these anonymous
>>>> curly braces altogether if possible.
>>>
>>> Having implemented TriG yesterday on top of the Turtle parser, I
>>> must say that I was happily surprised that TriG does not allow for
>>> triples
>>> outside {}.  This means you can detect whether a document is a Turtle
>>> or TriG document at the first triple.
>>
>> Why do you want to do that?      I'm imagining a world where people
>> load data by URL, not necessarily knowing if it's going to have
>> named graphs in it.
>>
>> I'd think in a load_graph operation, you'd accept TriG as well,
>> using the default graph as the output graph.   Maybe have a flag
>> about whether to ignore or raise on error if there are some named
>> graphs as well.
>>
>> And in a load_dataset operations, I'd think you'd accept Turtle as
>> well, and just not get any named graphs out of it.
>
> a hearty +1
>
> There is trig out there, so there's a cost to changing it, but that's
> a small cost compared to the missed opportunity have having compatible
> languages.

Observation: In the case of "Turtle or Trig", rather than the general 
mixing of Turtle and TriG in one document, it can be done with:

Accept: application/trig;q=0.9 , text/turtle;q=0.8

and looking at the Content-Type.

	Andy
Received on Saturday, 18 May 2013 10:30:26 UTC

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