On 29/11/15 23:40, Tara Athan wrote:
> On a related note, I see that ARQ Construct quad could easily be used
> to construct quads where the name is a blank node. Having the quad
> name be a blank node is fine according to RDF
> http://www.w3.org/TR/rdf11-datasets/#sec-introduction (and is
> desirable in my usecase), but is not permitted according to SPARQL.
Yes, that should be there. I'll add it.
When it gets into TriG or N-Quads it will become a document-scoped blank
node only, as do any other blank nodes.
> Are such quads
> accepted in practice, or does this cause significant interoperability
> problems?
It's RDF 1.1 that has taken over defining RDF Datasets and the syntaxes
for them, which allow blank nodes for graphs. I presume that any SPARQL
revision by a W3C WG would remove the definition of RDF Dataset from
SPARQL and use the RDF 1.1 one in its place with all the consequences.
SPARQL should not take a different position on data.
There is a long standing wrinkle that blank nodes aren't allow by syntax
in GRAPH in a WHERE clause.
RDF 1.1 adds in a natural requirement for blank nodes in quad data
templates in the graph position.
It's in the SPARQL errata.
http://www.w3.org/2013/sparql-errata
(because I have just added it :-)
>
> Tara
ARQ supports blank node addressing for when you must.
IRI(blank node) returns a suitable IRI.
Andy
