db_reference/1
db_reference(+Term)
db_reference(
)
Term is a db_reference.
recorda/3, assert/2, atom/1, atomic/1, number/1, var/1, compound/1, callable/1, nonvar/1, simple/1
recorda/3
assert/2
atom/1
atomic/1
number/1
var/1
compound/1
callable/1
nonvar/1
simple/1