Wraps the clauses in a minus group, removing from the enclosing group every solution compatible with the wrapped
pattern. Empty clauses, such as those produced by nil, are dropped first; when none survives, the result is
the empty fragment via nil, which callers must guard against where a pattern is required.
Generates a SPARQL
MINUSpattern.Wraps the clauses in a
minusgroup, removing from the enclosing group every solution compatible with the wrapped pattern. Empty clauses, such as those produced by nil, are dropped first; when none survives, the result is the empty fragment via nil, which callers must guard against where a pattern is required.