On 08/05/12 22:06, Gary King wrote:
Hi Steve,
I believe the spec is deliberately vague on the subject.
Hmmm, Okay. What is the benefit to being vague here?
If I'm writing a query and use FROM<data.ttl> shouldn't I be able to know
whether that graph already exists in the endpoint against which I'm querying? If
nothing else, the performance characteristics may be quite different.
s/vague/declarative/ :-)
Query starts with a dataset - it does not define how that dataset came
into existence - that's a matter for the rest of your toolkit.
The dataset description declares what's in the the RDF dataset to be
queried. SPARQL query starts at the point the dataset exists.
FROM<data.ttl>
says that <data.ttl> (resolved as a relative URI) is the graph for the
default graph.
Whether it's read in from the web (or filesystem, of the base URI is a
file:), or already locally cached, or locally built, isn't covered by
SPARQL query.
Andy
thanks,
--
Gary Warren King, metabang.com
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