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Re: Dataset Syntax - checking for consensus

From: David Wood <david@3roundstones.com>
Date: Wed, 26 Sep 2012 13:58:18 -0400
Cc: Sandro Hawke <sandro@w3.org>, W3C RDF WG <public-rdf-wg@w3.org>
Message-Id: <D81A96D6-0E6C-4D85-8CA1-AADB46607BA4@3roundstones.com>
To: Arnaud Le Hors <lehors@us.ibm.com>
Hi Arnaud,

We agreed quite early (Feb 2011) to "use http://www.w3.org/2010/01/Turtle/ as the starting point for the Turtle work" [1] and in April 2011 to limit syntactic sugar additions to Turtle [2].

IIRC, we had substantial conversations regarding the desirability of turning Turtle into a quad language, but we decided (without resolution) not to do that because:
- Turtle is widely fielded already
- We wished to minimize disruption, as per our charter
- Issues around datasets/quads were (and are) less agreed upon

Regards,
Dave

[1] http://www.w3.org/2011/rdf-wg/meeting/2011-02-23#resolution_1
[2] http://www.w3.org/2011/rdf-wg/track/issues/34


On Sep 26, 2012, at 12:42, Arnaud Le Hors <lehors@us.ibm.com> wrote:

> Hi Sandro, 
> 
> This discussion had already started when I joined the WG and as I caught it midstream I thought it was about extending Turtle. I've since then realized that this wasn't the intent and everybody seems to agree with that but I must admit that I still don't know why. Could you please explain or point me to some reference I could read to catch up on that? 
> 
> I have to say that the proliferation of formats for RDF makes me a bit nervous. This doesn't go along with making RDF simpler for the masses/industry and facilitating adoption. 
> 
> Thanks.
> --
> Arnaud  Le Hors - Software Standards Architect - IBM Software Group
> 
> 
> Sandro Hawke <sandro@w3.org> wrote on 09/25/2012 04:14:25 PM:
> 
> > From: Sandro Hawke <sandro@w3.org> 
> > To: W3C RDF WG <public-rdf-wg@w3.org>, 
> > Date: 09/25/2012 04:14 PM 
> > Subject: Dataset Syntax - checking for consensus 
> > 
> > I'm not sure how much progress we'll be able to make on dataset 
> > semantics tomorrow, so I thought I'd draft some proposals on dataset 
> > syntax.   The chairs can put this on the agenda is they like (but it's 
> > too short notice for these decisions to be binding yet).  I'm thinking 
> > it would be useful to see how close we are to agreement on these issues.
> > 
> > If you followup with votes, please use -1 for Formal Objection, 0 for 
> > abstain, +1 for approve.   Numbers in between are fine, too.
> > 
> > PROPOSED: We will produce a W3C Recommendation for a dataset syntax, 
> > similar to TriG and to SPARQL's named graph syntax.
> > 
> > PROPOSED: We'll request a media-type for this syntax which is different 
> > from the media-type for Turtle.  (That is, we will not consider this 
> > language to supplant Turtle and take over the name, becoming the new 
> > "Turtle", as was once proposed.)
> > 
> > PROPOSED: Our dataset syntax will allow for the expression of empty 
> > named graphs, whatever their semantics might be (to be decided). The 
> > syntax is an empty curly-braces expression, as in "<g> { }".
> > 
> > PROPOSED: Our dataset syntax will have some standard mechanism (to be 
> > determined within the next few weeks) through which a Dataset 
> > serialization can include some RDF data about the Dataset (that is, some 
> > metadata in the form of an RDF graph).
> > 
> > 
> > Below, there are groups of proposals which are alternative solutions to 
> > a design issue.   If you approve of more than one of the alternatives, 
> > please vote "+2" for your favorite.
> > 
> > * Name of the dataset syntax
> > 
> > PROPOSED: We will call our recommended dataset syntax "trig", 
> > capitalized to Trig as needed.
> > PROPOSED: We will call our recommended dataset syntax "TriG", but 
> > informally and in the media type, "trig".
> > PROPOSED: We will call our recommended dataset syntax "TriG", and use 
> > that capitalization everywhere.
> > 
> > * Use of equals sign, like <g> = { <s> <p> <o> } .  This is not in 
> > SPARQL but is in traditional TriG, for compatibility with N3.
> > 
> > PROPOSED: In our dataset syntax, a "=" MAY appear between the name and 
> > the graph.
> > PROPOSED: In our dataset syntax, a "=" MUST appear between the name and 
> > the graph.
> > PROPOSED: In our dataset syntax, a "=" MUST NOT appear between the name 
> > and the graph.
> > 
> > * Use of the "graph" keyword, which MUST be used in SPARQL and MUST NOT 
> > be used in traditional TriG.
> > 
> > PROPOSED: In our dataset syntax, the case-insensitive keyword "graph" 
> > MAY appear before the name, in a name-graph pair.
> > PROPOSED: In our dataset syntax, the case-insensitive keyword "graph" 
> > MUST appear before the name, in a name-graph pair.
> > PROPOSED: In our dataset syntax, the case-insensitive keyword "graph" 
> > MUST NOT appear before the name, in a name-graph pair.
> > 
> > * Use of curly braces { <a> <b> <c> } around the default graphs.   They 
> > MUST be used in traditional TriG, and MUST NOT be used in SPARQL.
> > 
> > PROPOSED: In our dataset syntax, triples of the dataset's default graph 
> > MAY be surrounded by curly braces.
> > PROPOSED: In our dataset syntax, triples of the dataset's default graph 
> > MUST be surrounded by curly braces.
> > PROPOSED: In our dataset syntax, triples of the dataset's default graph 
> > MUST NOT be surrounded by curly braces.
> > 
> > * Some designs for carrying for metadata
> > 
> > PROPOSED: In our dataset syntax, we'll say that metadata goes in the 
> > default graph
> > PROPOSED: In our dataset syntax, we'll say that the default graph goes 
> > inside curly braces and the metadata goes outside curly braces
> > PROPOSED: In our dataset syntax, we'll say that metadata goes inside a 
> > set curly braces after a keyword "meta".
> > PROPOSED: In out dataset syntax, we'll have a keyword "meta" followed by 
> > "default" or the name of a named graph, to indicate to readers where the 
> > metadata is.
> > 
> > 
Received on Wednesday, 26 September 2012 17:58:53 GMT

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