- From: Gregg Kellogg <gregg@greggkellogg.net>
- Date: Wed, 26 Sep 2012 11:44:53 -0400
- To: Sandro Hawke <sandro@w3.org>
- CC: W3C RDF WG <public-rdf-wg@w3.org>
On Sep 25, 2012, at 4:14 PM, Sandro Hawke <sandro@w3.org> wrote:
> 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.
+1
> 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.)
-0 TriG is not Turtle
> 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> { }".
-0 Expression of empty graph is okay, but querrying for an empty graph is difficult in quad-based datastores
> 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).
+1
> 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.
0
> PROPOSED: We will call our recommended dataset syntax "TriG", but
> informally and in the media type, "trig".
+1
> PROPOSED: We will call our recommended dataset syntax "TriG", and use
> that capitalization everywhere.
-0
> * 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.
+0
> PROPOSED: In our dataset syntax, a "=" MUST appear between the name and
> the graph.
-0.5
> PROPOSED: In our dataset syntax, a "=" MUST NOT appear between the name
> and the graph.
+0.5
> * 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.
-0
> PROPOSED: In our dataset syntax, the case-insensitive keyword "graph"
> MUST appear before the name, in a name-graph pair.
-1
> PROPOSED: In our dataset syntax, the case-insensitive keyword "graph"
> MUST NOT appear before the name, in a name-graph pair.
+0.5
> * 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.
+1
> PROPOSED: In our dataset syntax, triples of the dataset's default graph
> MUST be surrounded by curly braces.
+0
> PROPOSED: In our dataset syntax, triples of the dataset's default graph
> MUST NOT be surrounded by curly braces.
-0.5
> * Some designs for carrying for metadata
>
> PROPOSED: In our dataset syntax, we'll say that metadata goes in the
> default graph
+0.5
> PROPOSED: In our dataset syntax, we'll say that the default graph goes
> inside curly braces and the metadata goes outside curly braces
-0.5 metadata must go in some graph, having both default and meta is going in the wrong direction.
> PROPOSED: In our dataset syntax, we'll say that metadata goes inside a
> set curly braces after a keyword "meta".
-0.5 ditto
> 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.
-0.5 ditto
Gregg
Received on Wednesday, 26 September 2012 15:45:47 UTC