sparql_runtime:sparql

sparql_subquery(+Proj, :Query, +Solutions) is nondet

Execute a SPARQL subquery.

Arguments:

Proj

- is a list of variables that are shared with the outer query.

To be done

- Call the optimizer.

- Sub queries must be evaluated before the outer query, so we must move them to the head of the query evaluation. Not doing so causes no harm, but leads to repetitive execution of the subquery.