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named graphs set not empty if no FROM NAMED clause given #451
According to the SPARQL 1.1 Query Language specification the set of named graphs must be empty if a query only specifies
That means, the only way to express zero named graphs is to specify no
Having the following two named graphs in Virtuoso
and executing this query:
returns this result set:
Which states, that the set of named graphs is not empty:
I know this is by intent, but unfortunately this is against the specification. Do you plan to fix this?
Other services like Oracle and Stardog are doing it right.
Tested with Virtuoso v7.2.1.