Availability:C-language interface function
int PL_next_solution(qid_t
qid)Generate the first (next) solution for the given query. The return value
is TRUE if a solution was found, or FALSE to
indicate the query could not be proven. This function may be called
repeatedly until it fails to generate all solutions to the query.
If the PL_open_query()
had the flag PL_Q_EXT_STATUS, there are additional return
values (see section
12.4.1.2).
