Update comment

A Fuseki user found the text below and assumed

   { <http://rdf.freebase.com/ns/en.miles_davis> ?p ?o }
   USING <http://rdf.freebase.com/ns/en.miles_davis>
   { <http://rdf.freebase.com/ns/en.miles_davis> ?p ?o }

was like

   { <http://rdf.freebase.com/ns/en.miles_davis> ?p ?o }
   FROM <http://rdf.freebase.com/ns/en.miles_davis>
   { <http://rdf.freebase.com/ns/en.miles_davis> ?p ?o }

which it isn't (I hope).

The USING <uri> and USING NAMED <uri> clauses affect the graphs and 
named graphs used in the WHERE clause. This is identical manner to how 
FROM <uri> and FROM NAMED <uri> clauses affect the graphs and named 
graphs in a SPARQL SELECT query.

In most systems (not all) FROM reads a graph from the web and makes it 
part of the default graph.  It's LOAD.

(Yes, *a few* systems pick their FROM out of the dataset)

Doesn't USING select one or more graphs out of the graph store and use 
that for default graph.  Reading from the web is not allowed (I hope).

The use of USING in this instance is to avoid possible ambiguity of 
where statements being DELETEd from. If a USING clause appears, then 
this will override any effect that WITH may have on the WHERE clause, 
and only the WHERE clause.

What's "this instance"?


Received on Wednesday, 23 March 2011 21:30:08 UTC