
nonground(?Term, -Variable)

   Succeeds if Term is not a ground term and binds Variable to one of the
variables inside Term.



Arguments
   ?Term               Prolog term.
   -Variable           A variable.

Type
   Type Testing

Description
   Used to test whether Term is not ground i.e. whether it contains at
   least one free variable.  The argument Variable is unified with one of
   the variables inside Term, i.e. with one of the responsibles for its
   non-groundness.  When Term contains several variables, it is not
   specified which one will be returned as Variable.  As usual, metaterms
   are also considered variables.




Resatisfiable
      No.

Fail Conditions
      Fails if Term is ground.



Examples
   
Success:
    nonground(Term, V).       % unifies V with Term
    nonground(f(a,B,c), V).   % unifies V with B
    nonground([x,Y|Z], V).    % unifies V with Y or Z
    nonground(s(X{a}), V).    % unifies V with X{a}

Fail:
    nonground(atom, V).
    nonground(likes(man, woman), V).





See Also
   nonground / 1, nonground / 3, nonvar / 1, var / 1
