Comments on 9 "Specifying RDF datasets" (CR 6 Apr 2006)

9 Specifying RDF datasets
The text could be clearer about where the default graph comes from. 
The first paragraph hints at this, but the description is cloudy
because of the use of "may".  Thus the first sentence says
"A SPARQL query may specify the dataset
...".  The use of "may" in this sentence evidently refers to the
user, who "may" choose to use the FROM clause.  Third sentence
"The RDF dataset may also be specified in a SPARQL protocol
request".  Does this mean that it is the user's responsibility
to use at least one of these two techniques?  What happens if the
user uses neither?  Is this an error?  Or perhaps this would mean
the default graph is empty?  Or does some implementation-defined
default kick in?  The precise rules for determining the default
graph need to be specified.


9 Specifying RDF datasets
There is no statement of the formal semantics of the FROM clauses.

Fred

Received on Friday, 9 June 2006 05:40:12 UTC